I have a lg octane from verizon and i have had it since march of this year and?

for no reason like it happens at random times it'll shut off (it has a full battery). this happens ALL the time and its getting annoying! whats wrong with it? Also when i was on a feild trip i was taking pictures and after i took about 100 pics it wouldnt let me use the camra for 5-10 minutes and when i scroll the pics i need 2 wait on that pic for like 2 minutes before it shows up right while i wait its all black. this only happens for a couple of the pics. What do i do!