Iphone 7 continuous loop of apple logo
i had trouble making phone calls so I did an update on my iTunes. It didn't fix the phone issue, but It worked for two days than went into a continuous loop with apple logo. I did a hard reset and started it without my backup Icloud and it crashed several hours later. I called apple before it crashed and they said there was no hardware or software issues deteced. I'm a couple months past a year. What are my options? I'm no longer able to restart it on iTunes
iPhone 7, iOS 11.2.1