2013 ezgo 48 volt freedom

[Ransom276]

Hey guys I’m at not that familiar with the newer 48 volt set ups.
It’s a 2013 ezgo 48 volt with new alltrax 300 amp controller new solenoid 300 amp and new ITS. Code the controller is giving me this time is low battery voltage. Pack has 50.9 volts on it. I know batteries are couple years old but this thing has had me chasing codes all over the place. Charged it up yesterday and let it site over night. Had 52 volts when I backed it out this morning. Run fine and fast and responsive for maybe 10 mins then when I stop and start to go it starts trembling like low voltage. I pushed cart in my shop and didn’t get any push back from regan braking or beeps. That has me confused. Pack voltage when it started this was 50.9 to solenoid. Leaving solenoid it and going to b+ on controller it drops down to 45 then trembles and goes to 40 volts. I know low voltage is my problem but I don’t know why I’m getting it. Also getting the low voltage on controller side of solenoid. This is second new solenoid in last two days. Could it be two faulty solenoid or is there something else I’m missing?