Diox55 :
It's a pretty widespread issue it seems due to poor QC on the phones.
You could send it in for a replacement as David said, but I would try to return it and get another phone. LG will replace it for free if it does but the new one might just do the same so it becomes an endless cycle.
Actually after i contaced LG they replaced my old MB with new one that have been recalled as some people may name it and its been almost 6 months and the device still work like new , so i would call LG costumer service in case that something happen.
Btw the next phone that im going to buy its definetly won't be an LG phone it will be Samsung or Apple, because i used to have only samsung phones so i wanted to try some other company phone and i can say that Samsung phone are cost more money but definetly worth any cent.