When both cards work normal and hashrate drops below set parameter for 30 seconds, miner restarts and runs a startup script (to reset cards and apply overdriven settings). When one card goes off (0 h/s), I want computer to restart. Instead, after 30 sec of hashrate drop miner restarts itself and stops at "Loading kernels", because one card halted and needs to restart (i use switch-radeon-gpu instead of devcon).

Thats it. Windows running (i have hardware watchdog to restart it if pc freezes), srbminer process running (the same watchdog monitors it), pc hangs only after i try to end sbrminer task in taskmanager