Red line when turning phone off/PANIC FULL

Hey, my phone has been crashing a lot with a crash called “panic full” it turns itself off whilst the phone is locked and it won’t turn back on until I have plugged it into the charger, even when it has full battery I then check the crashes to find “panic full” and a crash which indicates when I tried to turn the phone back on like a “reset crash”. My phone has just frozen and I was able to turn it off and when I turned it off it went from right to left turning off but started with a thick red line that went down my screen then disappeared and the phone went black. I was able to turn the phone on and to see that my phone crashed because I was on “find friends” and “music”. Now my keyboard hasn’t fully uploaded and I don’t even want to keep exploring to see if there are any more issues! Does anyone have any help or advice, as I am out of the job and can’t afford a new iPhone and my store is closed due to covid!