crashed and went into a boot loop sequence for a few hour

I bought the Alcatel Idol 3 (5.5") in September 2015 and approximately a month ago it crashed and went into a boot loop sequence for a few hours. I managed to connect it to my computer and the loop became less frequent and I was able to back up all my media. I was ready to perform a hard factory reset but I thought I'd wait a few more hours and see what happens before I do it. It eventually just rebooted and ceased the boot loop sequence and became fully operational again so I did nothing and it was all good. I presumed it may have been due to a change of voltage or current as I was in South East Asia when this happened so I didn't worry too much.Then approximately a week and a half later the same thing happened, I again managed to back up my media and again thought I'd wait and see if it stopped itself. Again, it stopped and became operational once again. Then again today, approx. 2 weeks after the last boot loop it's happened again. It's extremely frustrating, also the battery is non removable which is a ridiculous feature to have on any electronic device, although I know Apple operate this way, which also makes them ridiculous! I might try and factory reset it this time, although I don't have much faith in this as I'm reading answers above that this doesn't solve the issue. Aghhh.

I think it is a poorly made phone, I bought it at a gamble as I had heard nothing about it. My advice is to just never buy Alcatel again and take it as a knock on the chin and a lesson in life.