ARGH detuning bass

Hey guys,

I’m having a really irritating time getting my bass sitting in key. It sounds fine in the higher registers, but when I play it at the octave I want it (like E0), it sounds a few cents off. When I fix it, it sticks for a second, but then like reverts back to the original setting. It’s getting really annoying, any fixes?

Are you using a bass sample or a synth?

quick fix would be to sample it when its good ?