Bro. twist an ICE sifu....if head unit reset (e.g all radio freq setting lost & need to set back) that means power supply from batt is cut out, unless he means that it turned off & then on again without losing it's memory like the radio freq it's definiely the remote supply problem
---------- Post added at 03:24 PM ---------- 6 hour anti-bump limit - Previous post was at 03:12 PM ----------
now i pressume your single HU original remote wire turn on all of the 4 ice items rite. add a relay from u'r HU remote wire. like we all know the 4@5 pin relay that we used e.g for that power horn is actually a switch that allows the battery supply direct to the working unit & it is turned on by the original power supply from the horn button (power from ur dashboard fuse).in this case, add another wire direct from batt to the relay, than the output should go to the 4 items in your ice, than your original remote wire for your HU acts as the trigger to the relay.

Yup, Bro. Izso, does the HU looses it's memory during shut down?