rate~ crashing gen~ when sync=off

having a weird + annoying issue here

i'm using a phasor to lookup a remapping buffer inside gen, and then use that curved output to drive a rate~

the remapping graph inside the buffer is generated through a matrixctrl and js.

every time i regenerate a new remapping function and overwrite the previous one, there's a 8/10 chance that the rate that's being driven off the remapped phasor will 'die' as in stop working and need gen to be re initialised to come back to life again

curiously, this doesn't happen when it's in sync 'lock' mode

my wild theory is that when i overwrite the buffer, phasor goes offline for a moment, and rate~ can't follow?

if it's in sync lock mode it can pick itself back up after the blip, but if it's in off mode maybe it's losing track of where it should be??

am i missing something obvious?

thanks