Hi Bestaflex, that behaviour sounds worrying.
I got my CE 04 right at the beginning back in April 2022 and have now done a shade over 8000 miles on it. Charging and discharging behaviour has been almost faultless. Each time the bike has had a service or new tyres it has had the latest software updates. I do most of my charging at home at 6A and when not in use try to keep state of charge in the range 60 to 80%. Once every few weeks I top it up to 100% just prior to a regular journey to avoid going below 20%. Occasionally, I have charged at 30A when trying to make quick progress on a long journey. I also avoid using and charging the battery at sub-zero ºC temperatures and very hot (for the UK) temperatures, say above about 30ºC. I haven't noticed any sudden drops in battery capacity from new. My only real complaints (niggles really) are that the predicted charging times at 6A are very conservative (it seems to charge way quicker than predicted) and when you hit an indicated 100% charge at 6A, it isn't really 100% since charging continues on for a considerable time, say another 15 to 30 minutes I guess. These comments only apply to 6A charging since I don't routinely charge at higher rates.
My point is that when working properly, the CE 04 battery and management system works very well and very reliably. It sounds to me like there is something wrong with your battery. Early model Zero SR/F and SR/S electric bikes had a similar problem whereby the charging system reported erratic SoC values resulting in, for example, the BMS reporting low SoC even after recent charging and then after switching off, waiting and then switching back on seemingly recovering a large state of charge. The community termed this "magic charging". I can't remember where I read it but one owner proposed that the issue was due to faulty (intermittent) connections between individual cells wired in series which resulted in fluctuation in battery voltage and hence SoC perceived by the BMS. Perhaps a similar fault exists with your battery. It's just a thought.
Regards
Bob