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Everytime i reboot my Xperia M4 Aqua the youtube app disappears and i have to reinstall it.
Any ideas on how to fix this?
Hi @Moose98, I am sorry to hear about that. 
This sounds very strange to me, and it mainly sounds like it could be software related. Therefore, could you try to perform a software repair using Xperia Companion, if you have not already done so?
Please let me know how it went!
I am using m4 aqua my YouTube app got uninstall I couldn't find it anywhere so I installed it from play store but after I restart my phone it was uninstall again
youtube it's a preloaded app unless you have a chinese version, are you certain that you haven't disable the app?
settings > apps > check the bottom of the list
No I haven't disabled the app
No i have not rooted my phone also it is not chinese version
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Hi @Chitrang
In addition to testing in safe mode, can you check your apps screen isn't sorted in "own order" which could mean even if the app is there you might not see it.
Go to your app screen > tap the three vertical dots in the top right corner > select sort apps > tap on alphabetical order.
Once you have done this, can you see if you are able to see the YouTube application now?