Google now, home button problems

[Robertj3003]

In the last 48 hours I'm losing it with my phone. I didn't do any updates or change anything.

My home button has stopped working and the letter t has also stopped working. Both randomly will work a small amount of times.

I've done a factory reset but the problem is still happening. My apps have also starred closing and google now pops up or google voice search pops up.

I'm not doing another reset to find all my stuff gone again only for the problem to keep happening.
On android 5.1.1 on a Vodafone ultra smart 6.

Any ideas?

Thanks