Final update: MikroTik acknowledged, that the issue is the RJ01 module itself. All hardware versions of RJ01 will show the issue, when used with RB5009. My RJ01 was exchanged for RJ10/r2 by MikroTik, which resolves this issue, as those modules work just fine and are not affected.
Statistics: Posted by ConiKost — Wed Apr 02, 2025 11:24 pm