i replaced 2.5a original power switching with a 10a ...
"overload detection" problem still happens, but not several times a day... but one or twice a week
Maybe cable or connector problem. What if you try to put new RJ45 plugs on booth end of the cable, or try with other cable (with thicker full copper wires).
How long the cabel betweeen Ubi and Miki device?
Maybe the new PSU give higher voltage then factory one, and the radio needs less amper, that cause less frequent overload. Maybe, if the PSU has voltage adjustment, you can add a little more voltage, but can be dangerous, if the radio doesnt support higher voltage then 24V