Question about Voltcraft SEM6000 CH

I operate 3 SEM6000s, one of which always connects quickly and without any problems. The other 2 are subject to an obscure arbitrariness: often only repeated attempts help. Very annoying. It is also incomprehensible why the daily ring buffer is limited to exactly 24 hours (instead of approx. 30 hours, for example), so it is actually impossible to record an entire day without gaps unless you stand next to it with a stopwatch or make 2 downloads, which you then have to put together. Furthermore, the daily memory in CVS_Format is inconsistent, which causes problems when analysing the data. It is a pity that there is no update for the firmware. The devices would be useful in themselves.