MultiPlus-II 48/5000/70-48 stuck in limiting absorption every couple of days

Hello,

It seems that MultiPlus-II 48/5000/70-48 stuck in limiting absorption every couple of day. After a reboot everything is OK.
It has the last software version.
My system includes 2 solar chargers (each with 10 panels) and batteries.
When it is stuck, batteries are not full (so, no limit there). Anyway, I also inject in the grid so no limit there.
Any ideas why this is happening? Anybody else encountered this?

Thank you!