I'm having some issues with my speeduino 0.4.3 board loosing sync after 550rpm. I have been simulating the crank input on the bench using a mega, using 36-1 crank (and jump leads), and have a vr conditioner set up on the board. The issue percists no matter where I take the ground from (even if I remove the ground), just consistantly loosing sync at the same rpm. It's as if the signal is weak, as I can wave my phone next to it and it looses sync. Ive tried tracing back the connections for any dodgy solder joints but cant find any.
Any help would be greatly appreciated, I've been pulling my hair out over the past few weeks trying to find the source of this.