Hey, so my lenovo vibe s1 has beenrecently charged to 100% while powered off when i turned it on after the lenovo green logo it would say andriod is starting optimizing app 1 of 1 and it would take up for like 15 minutes and then would go blank (but sometimes would show my homescreen black with the notification bar lagging and then would turn off) after that it will go off and then go on again. the cycle would only stop if the battery runs out and this was not the first time. what should i do?