If I recall the PF350 has a built in limiter and has a history of shutting down to protect itself.
You may of been pushing the amp too hard with a single 112 cab unless you’re playing quietly !
I tried the PF500 with two 210 Ashdown cabs and it felt underpowered, the PF800 I tried was good.
The Ashdown RM500 and RM800 both have plenty of power with one or two cabs.