scipt stops running an grid meter disappears, password gets lost

[ThomasSiebnen]

Hello,
I have a Fronius Symo Inverter, a Fronius Smartmeter and Multiplus II with a Pylontech battery installed.
The venus.dbus script on the Cerbo-S is running perfectly.

But from time to time (every fifth day or so) the script stops and the battery is not charging.
On VRM the device list, the Grid meter disappears. If a change the ESS to internal meter, it resumes charging.

To fix the issue, I connect with the PuTTY program, but strangely, the Cerbo password gets lost and only after resetting it via the remote console, I am able to log in. The commands "kill_me" and "ln ...." make the grid meter appear again.
Unfortunately, the problem repeats after a while.

Who can help? I appreciate very much and many thanks in advance.