So my iphone 4s is acting funny.

So my iphone 4s is acting funny.

Sometimes the wifi is greyed out (and the fix showed by Apple didn't work)

Sometimes after a restart the wifi can be turned on but it will not scan for networks(adding them manualy makes no difference)

Sometimes it shows wifi networks but after typing in the WPA2 password it cant connect

Sometimes it connects but when trying to access the internet is dissconnects and the wifi gets greyed out

Sometimes it does not ask for the SIM PIN code(calling works)

Sometimes Itunes can't recognise it.

And overall the phone is very slow and often the settings.app dosn't respond to touches.

The volume control on my Apple Iphone headphones is not working at all.

I have 2 months of warranty left(phone bought in Poland from a authorised retailer)

I have tryed restoring it with/without backup many times now.

If anyone could help i would be very happy