JJ sync clock issue

Hi forum it's my first post so excuse me if this has been mentioned before .

I have just bought an old blue MPC1000 and upgraded the OS to the JJOs2xl and i seem to be having timing issues using the Mpc as a master clock . it drifts by about 4 BPM so it's quite bad .
Is this a known Issue ?

Thanks in advance
Freak

MIDI Clock or MTC?

My 2500 with JJOSXL has always been rock solid as an MTC master with REAPER.

Write more info on your routing/ setup. have you checked on empty sequencer or you got project loaded that lags?