I have the same problem with my CA249 actually. Much like your problem, it seemed to happen spontaneously. It happened after I had shredded a piston and swapped in a new one (I had done this before with no prior problems). I ended up swapping the stock CA piston head for a stock TM one and it did make a bit of an improvement. It still shoots a bit low for the spring but it seems to have quasi-fixed the problem.
I'm running:
SystemT tightbore
Prometheus Red hop up
SystemA piston
TM piston head
I was planning to swap out the piston/cylinder head to see if that is a permanent fix.
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