Thankyou so much for all your comments and help. I honestly did do my reading, but not what has been pointed out. So I stuffed up.
I rebuilt using bionic before reading the last of those comments, but its up and running so Ill see how it goes.
The first thing I notice is the CPU is running at 47c instead of 57-60.c I also changed IP address and it instantly changed it without reboot. Two big differences already.
In trawling the logs I did notice some DNS messages. Now they make sense. So it looks like pihole was having problems with Jessie as well, just like you point out.
So all up, although its only been running for an hour or so its already looking better.
Thankyou very much for the help. And hopefully I wont be back on this thread !!
colic got a reaction from Werner in Orange Pi Zero loses connectivity - logs erased