Won't power on after reboot looping

Hello, I was wondering if you thought my iPhone is repairable or not. Here is the background: I received a new in warranty replacement phone from Apple Store in October. A little over a month later, I Noticed the "selfie" camera wasn't working at all ( I hadnt even tried it until this point) I took it to apple and they wanted 329 bucks to replace it since warranty had just ran out two days prior. I opted to do without the camera. For the next 8 months, the phone was fine aside from the selfie camera. In June of this year, I decided I needed the camera to use FaceTime. I took it to a local repair shop to have the camera replaced. I dropped it off, and when I returned, they stated that when they put in the new camera, the camera still didn't work. But when they put in the old camera, it worked, but it was glitchy with weird static and lines sometimes. Over the course of the next week, I noticed my phone had started rebooting itself randomly because I had to enter my passcode sometimes instead of using the fingerprint scanner. Then about a week later, while on a trip while using the phone as a gps, it rebooted and kept rebooting over and over For about an hour. Finally it stopped after I did several hard resets. It worked for a couple of days, still rebooting randomly. A couple of days later I found my phone stuck on the apple logo screen. I tried a hard reset once again, but this time it never came back on. It won't power up at all. When I try to do a dfu reset it gives error code 4005 usually. This is where I am now. Do you think you can help? Apple still offers to do a 329 dollar swap. It at this point the new iPhone comes out in about two months. So that makes little sense. If it can't be repaired Should I juts eBay it and get 100 bucks for it or whatever.