Hi Keith,
Thank you for getting back to me so quickly.
No different between day 1 and day 4. But I did find the issue! It was my phone & ipad charger which is one of the new Anker Ga twin type c charger that was causing the problem. If I had it near me or was touching either the phone or ipad it would cause the problem. When it was further away and or not in contact with me it was fine. I have no issue with my macbook which has the new 140w Ga charger. So pretty sure it was down to RFI from either the charging block / the cable causing issues.
Cheers.