Only thing I could suggest would be to...
Anything please. I am about to the point of throwing this thing out the window.
Yep you said it right there. Get rid of it and buy an SA or Para (or a Colt if you can come across one
).
I don't have a clue what to tell you about the other problems, except that the whole gun may not be built right and is causing even good quality parts to fail prematurely.