LEDs randomly shut off with ERROR1 on F/W >v1.8.5

I have several shelly dimmer 2 devices in my household.

More recently one of those devices started to exhibit a problem.

When I turn on the problematic lights they will turn off again within 10 sec to several minutes.
It doesn't seem to matter at what brightness level I am using.

The LEDs (3 pieces) have a total wattage of around max 20w

When the error occurs the webpage of the culprit device reports: "ERROR 1" and the device has the "turned off" icon/symbol.
"ERROR 1" I can see relates to potential problems with zero crossing as well as general noise on the AC line.

* Tried changing the LED bulbs with no effect as this was easy to do.

* Tried running 1 LED alone, removing the other 2.

* Tried calibrating both leading and trailing edge dimmer modes. No effect.
* Tried to factory reset the device. Didn't help.

As the device had been running stable (at some point) I decided to try some different firmware versions.

The one that seems stable (so far) is F/W v1.8.5.!!

I also tried the following here, but all with bad results.
v1.9.0..ERROR1
v1.9.3-rc3 ..ERROR1
v1.9.3-rc4 ..ERROR1

So something in the firmware between 1.8.5 and 1.9.0 apparently seems to have made things worse for me.

I should also mention that I have 3 other shelly dimmer 2 devices which are all running F/W v1.9.3-rc3 and they do not exhibit problems like this at all.

here's the dump of the device at the point of failure.

{ "wifi_sta":{ "connected":true, "ssid":"xxx", "ip":"192.168.1.181", "rssi":-61 }, "cloud":{ "enabled":false, "connected":false }, "mqtt":{ "connected":false }, "time":"16:41", "unixtime":1608136912, "serial":621, "has_update":true, "mac":"40F5200165A5", "cfg_changed_cnt":18, "actions_stats":{ "skipped":0 }, "lights"

{ "ison":false, "source":"http", "has_timer":false, "timer_started":0, "timer_duration":0, "timer_remaining":0, "mode":"white", "brightness":67 } ], "meters"

{ "power":0.00, "overpower":0.00, "is_valid":true, "timestamp":1608136912, "counters"

0.000, 0.000, 0.000 ], "total":980 } ], "inputs"

{ "input":0, "event":"S", "event_cnt"

}, { "input":0, "event":"", "event_cnt":0 } ], "tmp":{ "tC":50.67, "tF":123.20, "is_valid":true }, "calibrated":true, "calib_progress":100, "calib_status":0, "wire_mode":1, "overtemperature":false, "loaderror":1, "overpower":false, "debug":0, "update":{ "status":"pending", "has_update":true, "new_version":"20201124-092706/v1.9.0@57ac4ad8", "old_version":"20201202-141422/v1.9.3-rc3@50c6ab57", "beta_version":"20201202-141422/v1.9.3-rc3@50c6ab57" }, "ram_total":48368, "ram_free":35556, "fs_size":233681, "fs_free":113954, "uptime":19377
}