Information that might help others if encountering same problem.
Carried out 3 short flights at 1080,2.7k and 4k.
Later on switched on RC, Mini2 and Mobile device to check some parameters.
Got continuous short beeps from RC. Tried Calibrating Rc but no joy to silence beeps. Tried switching on Mini2 again and carried out pairing actions to RC still no joy.
Shut everything down again and then managed to Re-calibrate RC and beeping eventually ceased.
Checked everything indoors and all seems well.
Might help if somebody else experiences same problem.
( Beeping happened after RC was fully charged).

What was the charge level of the battery in the Mini 2?

Hello there yogi053. Thank you for reaching out and for sharing these informative information here at DJI Forum. Again, thank you for your support and keep on flying.

Mini2Flyer Posted at 1-21 16:06
What was the charge level of the battery in the Mini 2?

I had flown 3 flights of total time 13 mins. When I went to recharge the battery 3 LEDs were flashing.
Come to think of it, I did put a fully charged battery into the ac but cannot remember if problem disappeared before or after inserting new battery. Age thing!
Weather good here today, so think I will fly at least 1 battery and see if all ok still.

yogi053 Posted at 1-22 02:05
I had flown 3 flights of total time 13 mins. When I went to recharge the battery 3 LEDs were flashing.
Come to think of it, I did put a fully charged battery into the ac but cannot remember if problem disappeared before or after inserting new battery. Age thing!
Weather good here today, so think I will fly at least 1 battery and see if all ok still.

UPDATE:- Took the Mini2 out and flew around my local park. This is a wee magic machine. Everything went perfect and I am so pleased with it. I only lost connection to the RC once and that is because I put the building in the photo between me and my drone. I hit RTH and took control when connection re-established.
Stay safe everyone.
NB. didn't break lockdown flew from my front door and back!

Glad that is seems to be sorted.

Mini2Flyer Posted at 1-22 07:10
Glad that is seems to be sorted.

Thank you! Really chuffed with this wee machine. (Touch wood).

Glad it's working OK now!

DJI Stephen Posted at 1-21 19:22
Hello there yogi053. Thank you for reaching out and for sharing these informative information here at DJI Forum. Again, thank you for your support and keep on flying.

I have this issue come up occasionally and in my case, I have found it has to do with interference of some sort and happens more frequently when trying to work with my drone indoors. I look at it as a warning, after all that what constant beeping means right? anyway, if anyone has this issue, the first thing I would do is go outside and make sure you are not having any magnetic interference issues.