Why my all buttons except switch on/off and volume up/down doesnt work

Last night all was fine my phone was working.When I woke up today at the first touch I noticed sth is wrong.Than I was trying to get back from application but button didn't work.Than I was trying to push windows button and didnt work also finally I tried to turn back home page with home button but it didnt work as well.And I decided to charge my phone on computer I connected with cable but on every 10 seconds connections was dissappearing.Charge device didnt work as well.I dont know what happened in the night.Maybe because of update to lollipop but I m not sure.I restarted but phone even with hard reset but its same.Idk if you can help m guys but I m totaly innocent...

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