H815 UK not receiving or being able to make phone calls after root.

After rooting my H815 (Vodafone UK) throughout most of the day I can't receive or make phone calls, the signal also at times during the day will completely go and I have to restart to get the signal back (which sometimes works) However I can text and use the Internet.

The main problem I've noticed is when I call someone it automatically goes to 3G and works but if it remains on 4G it will say dialing then completely loose signal then when I hang up the signal comes back.

Anyone know a solution to this?