Istop.. new battery, soft reset ... still not working

[ilongstaff]

Hello all
I have a bit of an issue with istop. Following a recent service and the recall for upgrade to ECU (regen), I noticed that istop was not working. I went through all of the parameters to ensure that there was not something stopping it from working, no deal. I then did a soft reset, still not working. I checked the battery and although still working OK, a drop test showed it was not in best condition so I replaced with a Mazda supplied battery. Soft reset of Istop, still not working.
Yesterday I did a 400 mile journey, checking / testing at regular intervals, further soft resets, still no deal.
The Mazda service team flatly deny any linkage to the ECU upgrade so I'm reluctant to have them diagnose if there is a (different) simple solution out there I might try first.
Any thoughts please??
TIA

[Gus]

I have not had a problem with the CX-5 but when I had the CX-3 I sometimes had to put it on the charger to charge the battery fully iStop then kicked into normal operation again, worth a try?
What is the iStop screen showing on the infotainment?