Samsung - suddenly discharging the battery and then turning off the battery

Hello, I would like to ask what to do when the flashlight on the phone (Samsung galaxy J1) suddenly runs out? Basically, 100% gets to 80 in half an hour - but I understand that, because I play with a mobile phone, for example - internet music. But what scares me is that when it gets below 50 - and now sometimes even 60%, the mobile phone turns itself off and has to be put into the charger and shows that the flashlight is charging from 0 !!!! I tried all possible applications to save battery, restart to factory settings, etc. - nothing helped! I'm thinking of buying a new flashlight, but what if there's a bug in the system? I don't want to waste money! What's more, I find it weird that when I pull the mobile phone out of the charger to 50%, for example - it doesn't turn off, it works just fine, and as soon as it gets below 20%, it says that I should charge it! So I don't know, isn't it possible that it's somehow set to turn it off at 50% ??? thank you very much!!!;)         
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