i have pd 0.52 running on a raspberry 4 for an art installation. 

i don't need audio, so initially i disabled the dsp. i noticed that occasionally a [metro 1000] that i loadbanged was banging constantly (very very fast). after i enabled the dsp, this does not happen anymore. however, as soon as i get an audio i/o error, the metro just stops outputting bangs. is this a known bug? if so, is there some way around it? or ist this a raspberry specific issue?