[L520] Not working properly after updating?

[Windows Central Question]

After updating to 8.1, my Lumia 520 is having many problems like it lags oftenly, especially music and video centres, apps terminate al by themselves and much more. All these problems started after updating to 8.1 only.

 

[Zulfigar]

Do a soft reset (Volume Down + Power Button for 10-15 seconds until vibrate is felt).