Answer to: Stuck on "Android is starting... Optimizing app 1 of 1."Alcatel a5 led Android users having problems with phone try uninstalling the SKY SPORTS FOOTBALL SCORE CENTRE app. My phone was acting strange. Random reboots and each time the sky shortcut disappeared. I ended up factory resetting my phone. Then after a reboot I found it took ages and was optimising app 4/4 for half an hour until it booted. I read about a couple of other apps causing this which I don't have. Also I read about certain apps taking ages to install. Sky sports was one of these about ten mins to install. So I uninstalled it and hey presto by phone is back up and running great. Boots straight away! If only I knew this before I reset it however other apps have installed better pi music player has the skip track function on lock screen now.