Immobile in Minecraft by sprinting + tab, what to do?

I have the problem that I sprint on ctrl and when I hit tab. My control then seems so frozen. I can only press the Win key to escape from the state. Can someone help me that I can press Ctrl and Tab at the same time again?

It is mostly on full servers that there are a lot of players and on tab you execute the player list, which means that it lags for 5-10 seconds (longer on poorer PCs) otherwise I don't know what that could be