I recently switched over from OpenVPN to run my VPN to windows build-in L2TP.

Now I errors like:
socket closed while listening on udp:10.10.1.3:55389 : Call interrupted (10004)

Tixati recovers from it automatically pretty well, but it hurts the speeds. It happens roughly every 3min...

Anyone knows what causes it, and if there are hidden settings to increase a timeout setting or something?

UDP doesn't use sockets per-se. What is error 10004