Turn phone off, plug in charger for 15 minutes, while still plugged into charger turn phone on. Sometime a little extra juice during startup will knock it out of the loop its in. If this fails try starting it in Safe Mode. If it starts up then you have a third party app that's causing the problem.
We want to ensure you fix your device, tomsna18. When did this begin? Have you recently updated the software on your device?
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