Oh my goodness! That is no good at all. Wiping the cache, resetting the phone, taking out the SD card, and running it in safe mode are about the only things you could have done to resolve this. It's unfortunate but I think it may be time to replace that phone. Do you know if you have insurance on your line? If so, you will have an extended manufacturer’s warranty on the phone and we can replace it for you.
Hey there! We hate reading about a device with a long life span suddenly turning like this -- kudos to you for trying everything you could to bring it back to life! We just wanted to check in and see if you'd had any luck with the troubleshooting after all or if you'd sought replacement equipment. How is everything going?