I have 2 x stc1003 connected to 2 bipolar steppers and to a pc via vint hub and everything worked fine until I switched the set up on today. The steppers started making a singing noise and phidgets control panel can't see STC boards anymore (only another dcc1003 that is hooked up).
I never had anything like this before so unsure if the stc boards or vint hub are dead or if this is symptomatic of another issue. Sadly, I don't have spare boards to test replacing them.
The only change made today was upgrade to latest firmware and phidgets drivers and that worked ok for few hours.
Did anyone experience anything similar? Please help