Except that the symptoms aren't indicative of a power failure. Start with the interconnects.
I dunno, it def could be an interconnect issue. But when I buy new gear I put it thru some pretty nasty bag kicks and shaking around in my bag to see if all of my connections were good, and 9 times out of 10, if I was having spikes or the like, it was because of subpar power connections. I didnt trust the Sony L/M style 7xx batts because they kept dying on me, so I switched to 9.6v NIMH RC batts, and I was always nervous of all the connections, so once duct taped before every show, things were 100%, but if I didnt have the batts placed perfectly in my bag and the RC batts werent taped, I had spikes, so thats why I would at least start by tweaking the v3s split on the inside of the power connector. Even if its not a power issue, then it still couldnt hurt to fix that now and avoid problems in the future
As always, YMMV!