Loosing WiFi?

[mar04]

iPhone keeps jumping onto 4G.  Suddenly found it's used all my data not half way through month.  Why is it doing?

[NJP77]

My wifi drops out regularly. I've had to top up my mobile data (I  have plenty of data for my usage).

My sky box regularly loses connection too

[JimM1]

@mar04 You should switch mobile data off and see what the phone does!