2011 Dodge Durango

So my 2011 Dodge Durango RWD Crew.
Couple months after buying it, it wouldn't
start. The dash lights and everything
worked but would not turn over. Paid for a
mechanic to come out, he disconnected
the battery and boom it started.
Few days later same thing but this time
that didn't work lol more. Towed it to
dodge and as soon as it entered their lot, it
started up again- they couldn't replicate
the issue because no check engine light
ever comes on so we drove it back home.
One day driving to costco my battery light
came on but it was still running, hour later
came back it started but the battery light
came back on. As I got onto the freeway
the electrical just went haywire! Windshield
wiper was at full blast, AC blew only hot
air, everything was just flashing !! Towed it
to dodge again! They replaced the PCM
and new battery $1200 later it was working
just fine!!! 4 months later it won't start
again car died at my work and a tow came
out... he suggested to bang the starter and
it worked!! Went home and said ahh it's
nothing! Just bang the starter if it doesn't
start up. I could go by a month without
having to bang the starter then it gradually
got worse. Had to bang it every week and
now to every day to every couple hours if I
wanted it to start! So we ordered the part,
replaced it and was sure it would fix the
issue but nope!! 3 weeks now and I still
can't figure it out. I don't have the funds at
the moment to tow it back to dodge while
making my payments still. Just frustrated!!
What could it be??