Traktor Pro - Midi crash during performance

Hello everyone and Merry Christmas!

I have Traktor Pro and M-audio uc-33e controller. They fit my need perfectly, but I experienced problems sometimes. My problem is always the same... during performance my Traktor loose midi signal, so I have to restart Traktor and after that everything is ok again. But today I got this problem twice for just one hour and I have a DJ performance tonight, so I'm really afraid not to have this problem during my performance this evening.

When I lost my midi signal last time, I opened Ableton Live to check if I have midi in general and I had midi in Ableton, so the problem is not in my controller but in Traktor.

What to do? Is there any way to reactivate midi without restarting Traktor?