Hog 500 freezing problem

Hi folks,

since yesterday my hog 500 keeps freezing during normal operation. No error message is displayed and all buttons and faders are no longer reacting when it freezes. After a restart I get “old show corrupt” and have to reload the show to get it working again.

I have already tried deep clear and reset and loading different shows but after a few minutes of operation it keeps freezing. I have performed the RAM exercise and it passed.
Has anyone ever experienced similar problems or does anyone know how to fix this problem?