I do not have older ones showing the issue unfortunately, as I had opened up the pack, addressed the most likely issue, then shrink-wrapped it back together before hopping back on the forums and seeing your reply. However, I believe you are 100% right on this Jinra; I originally connected my series via magnets. 3 sets of 2; so 2 magnets connecting the last 3 batteries together, in order to connect the two series. I forgot to mention it due to my stoner lifestyle thanks to some California Kush lol.
While they were not disconnected when I opened up the pack, the magnets still slid around the first time I wrapped the pack up. I suspected that they were disconnecting suddenly due to riding around/vibrations; it would explain the sudden “battery drain” message at a 0% charge despite being at a 70% charge just before.
So this time, in order to ensure that it is not a possible point of connection failure, I removed the magnets and soldered 14 awg wire to connect the series together. I also confirmed that all cells are reading properly, and did a quick 10 mile test ride with no issues so far. Here is a picture of it currently with the soldered connection (please note, the last 3 batteries on the right have clear-wrap, as the original pink wrap was damaged by me):
EDIT: I noticed the older pic was my 10s5p, here is my 10s4p when I first finished it but before I wrapped it. I have already replaced the magnets with soldered wire.