Hi, new here

Im gonna get to it cuz Im trying to get this figured out. So i converted a walmart MTB..

got a Pinty 500w front hub 26" off amazon,
and using (4) 10s2p batteries in parallel to make an 8P with about 10amp output each continuous. Got these on ebay from "alarmhookup" if youre familiar with his discount packs of the LG batteries

I built this bike for courier/delivery work in NYC and average 20-40 miles per day jetting around. (I wish for more range)
I started doing work a few weeks ago and have been putting the bike through its paces and wouldnt say I ride it "hard" but not soft n casual as this a business bike.

After a few weeks of work the throttle started cutting out one day. I had power, and Id throttle and nada... or it would start... cut out...then kick back in with out me ever bringing it back to zero... eventually it died. I wrote the company and they sent me a whole new kit.

NOT LESS THAN A WEEK later the issue starts again, new throttle. So i limp back to my storage unit where i keep the bike and swap in a new controller just to eliminate one option (not the controller)

I found this crafty article about testing throttles on ebike. ca (cant post links as a newbie)

if these numbers are right, what i was getting at "rest" was about 1.5v and at full it was 2.5.
Low on the high side, but on the low side wouldnt that mean that the motor would get some signal right off the bat and jump without me giving anything?

At any rate what other issues could there be or are these just crappy throttles??

Another issue, and maybe i should start another thread, but I feel like the range is crap. 4.4ah per battery at an 8p I was hoping for 30mi per charge but im im barely getting over 20mi, maybe 25mi before the first throttle crapped out. Im feeling like there has to be a power leak some where or just these cells capacity is diminshing by the minute.

thoughts and ideas?? TIA