PyCharm only opens the first time you try after rebooting Windows

It started yesterday that PyCharm won't start (it hangs in the splash screen) if you have already used the software once since rebooting the computer.

I have removed the latest version and switched to the 22021.2, did a complete removal (including manual registry cleaning) and tried every single suggestion (redistributable C++, adding exceptions to Windows defender, etc.)

When starting it using pycharm.bat, I get the following.

2021-12-17 20:21:27,153 [ 483] WARN - ntellij.ui.svg.SvgCacheManager - Icon cache will be recreated or previous version of data reused, (db=C:\Users\pedro\AppData\Local\JetBrains\PyCharm2021.2\icons-v3.db)
2021-12-17 20:21:27,155 [ 485] WARN - ntellij.ui.svg.SvgCacheManager - Icon cache will be recreated or previous version of data reused, (db=C:\Users\pedro\AppData\Local\JetBrains\PyCharm2021.2\icons-v3.db)
2021-12-17 20:21:28,594 [ 1924] ERROR - llij.ide.plugins.PluginManager - java.lang.IllegalStateException: failed to create a child event loop
java.util.concurrent.CompletionException: java.lang.IllegalStateException: failed to create a child event loop
at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:314)
at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:319)
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1702)
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1692)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183)
Caused by: java.lang.IllegalStateException: failed to create a child event loop
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:88)
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:58)
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:47)
at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:59)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:86)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:81)
at org.jetbrains.io.BuiltInServerKt.multiThreadEventLoopGroup(BuiltInServer.kt:158)
at org.jetbrains.io.BuiltInServerKt.access$multiThreadEventLoopGroup(BuiltInServer.kt:1)
at org.jetbrains.io.BuiltInServer$Companion.start(BuiltInServer.kt:58)
at com.intellij.idea.SocketLock.lambda$lockAndTryActivate$2(SocketLock.java:168)
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700)
... 6 more
Caused by: io.netty.channel.ChannelException: failed to open a new selector
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:175)
at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:142)
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:146)
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:37)
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:84)
... 16 more
Caused by: java.io.IOException: Unable to establish loopback connection
at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:94)
at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:61)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/sun.nio.ch.PipeImpl.<init>(PipeImpl.java:171)
at java.base/sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)
at java.base/java.nio.channels.Pipe.open(Pipe.java:155)
at java.base/sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:142)
at java.base/sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44)
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:173)
... 20 more
Caused by: java.net.SocketException: Permission denied: connect
at java.base/sun.nio.ch.Net.connect0(Native Method)
at java.base/sun.nio.ch.Net.connect(Net.java:476)
at java.base/sun.nio.ch.Net.connect(Net.java:468)
at java.base/sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:692)
at java.base/java.nio.channels.SocketChannel.open(SocketChannel.java:194)
at java.base/sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:127)
at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:76)
... 28 more
2021-12-17 20:21:28,601 [ 1931] ERROR - llij.ide.plugins.PluginManager - PyCharm 2021.2.3 Build #PY-212.5457.59
2021-12-17 20:21:28,605 [ 1935] ERROR - llij.ide.plugins.PluginManager - JDK: 11.0.12; VM: OpenJDK 64-Bit Server VM; Vendor: JetBrains s.r.o.
2021-12-17 20:21:28,606 [ 1936] ERROR - llij.ide.plugins.PluginManager - OS: Windows 10
2021-12-17 20:21:28,607 [ 1937] ERROR - llij.ide.plugins.PluginManager - Last Action: