Won't charge, loosing signal, headphones jack doesn't work

It sounds as if you either purchased a faulty charging port or there was a mistake during installation. The ribbon in the port has circuitry traces that run through it and if flexed too much, can sever or damage those traces. As you are probably aware, the headphone jack, Charging and cellular antenna are all part of the port assembly. My suggestion would be to reinstall your old port, paying attention to the loose charging port to try to secure it better during reinstall and return the new one provided you are confident there was no damage or faults in its installation. If your old one works fine again, my theory is "Don't fix it if it's not broke" ;-)

You could make another attempt with a new one if you believe the loose port is not fixable with old one. Best of luck!