Just got my RC-S and the first thing I did was coat those terminals with silicone dielectric. My opinion is that 52 Volts is sufficient to cause sparking if the battery is jostling. If I were doing much off asphalt riding I would also wrap the battery with an Ace Velcro wrist brace, which I do on my R1U 700. Time will tell if there's any benefit to this precaution. BTW, your record keeping is awesome
Defintely using dielectric grease this time if I can get it fixed. Just never bother using it because it's been working all this time & the battery seemed secured.