Anybody with ANY of these new batteries having any random reboot issues??? Just asking. Thanks
		
		
	 
No.  I had it reboot once and then thought the batt was dead(had low power here and was using the phone on 3g/cell quite a bit), but it seemed to turn out that the batt was a bit loose and has lost contact temporarily with the pins(reboot) and then completely(dead seeming).
I discovered that when I hooked it up to charge but nothing happened, so I removed the back cover and the batt just fell out.  I put it back in making sure that it was nicely seated, re-did the back cover making sure that all edges/corners were firmly in place and I haven't had any problems since then.
I did have a case of constant rebooting with the stock batt one evening, in fact the one before I received my Anker 3500mah, but the next morning with the stock batt it was behaving itself so I suspect Sprint screwing with their network, apparently trying to make it worse(if that's possible -- 1 get 56k in "3G" and Wimax ends a few miles N of me but from a pcmag article the whole metro area has pokey speeds even wimax, T-mo is like 300x the data rate) in my metro area.
Anyways, into my second full charge, been running still as before 3g/cell always left on now, light usage, stock fw @25% charge and c. 4d since charging.  I did use quite a bit of wifi/3g one day and ended up with batt temp warnings although it could've been due to a few apps that I dled to test out might've been trying to suck massive ads across godawful slow 3g. (I took the lazy way out, rebooted it and let it sit in AC for a while, then it was a happy camper again.)
i.e. AFAIC the batt works as advertised. Whether or not it's actually 3500mah, I don't know, but for the price and the time between charges that I can get I'm happy, but I'll probably also try the 1900mah + external charger so that I can use OEM accessories that I picked up, car mount, dock, etc.