Fortnite | Why does my Fortnite character sometimes just stop sprinting?

I know that does not really belong on this site, but I do not know where else to ask. My problem is that when I'm in a match and sprinting, my character suddenly stops sprinting and stops. Then I have to lift my finger and put it back on the button. I have no idea why this is so. In Minecraft, I tested earlier, I do not have this problem. If I press W at start, that is, bottom left, just like I do ingame, it works perfectly so "W" will be "spammed" just like it should. So it's not on the keyboard either. Have cleaned them today, is a 40 euro mechanical keyboard with a relatively large distance from the keyboard floor to the key, so you can do this well. The keyboard is relatively new. I just wonder why it is that my character just stops suddenly. The problem described does not always happen when I change weapons, get the blueprint, and so on, but only sometimes. I say ca in a 10% case, my character stops and I have to put my finger up again. Maybe one of you knows about this, I really do not know what to do next. Please answer properly, because I do not know where else to ask.

Thanks in advance. LG Alex

This is a now normal Fortnite bug that's just so but it goes away after a while…