PCM reflash advice for strange electrical faults?

I am hoping someone may be able to help me get to the bottom of my issue! I have a 2016 Mazda 2 1.5 Skyactiv and it has some strange problems going on! I am based in the UK.

The main problem is with the odometer display, in that it keeps switching itself on and off, there is no rhyme or reason to it, it is very much an intermittent fault, along with this the battery mgmt. system will also occasionally display a fault causing the i-stop to not work and start to flash. This occasionally seems to sort itself out when the engine is turned off and restarted.

I have had the car looked at by an auto electrician and this has baffled him too, there are no fault codes, and battery is running as it should, he has suggested a PCM reflash as this may solve the issue (but again is not sure). I have contacted the main dealership and they have quoted their hourly rate, but in the next breath said this is if we don't find any other issues. I have had such bad experiences in the past with mechanics and garages that this was a big red flag to me unfortunately.

Has anyone else similar issues with this type of problem, and if so what was the fix?! Also is a PCM reflash something that can only be done at a Mazda dealership or is it something that I could get done independently?

Any advice would be most greatly appreciated.
 
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