Just reached the 750 round mark Yesterday. My SW9VE remains accurate and reliable. However....

I think I experienced a possible double feed attempt as my Sigma jammed a few times. Wasn't a stove pipe. Research I've done tonight tells me maybe a weak magazine spring? I have not cleaned my magazines at all. Should I give them a good cleaning? Hoppes 9 solvent? Should I lube them? Also want to add this didn't happen consistantly. Last couple of mags I put through were fine. Been using the same ammo. Rem UMC 115 Gr Metal Case Mega Pack. What could be the problem?

Thanks in advance.

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Sigma 9mm/XD 9