Changing device order of P2000 in the MOST(fibre optic) ring

Sometimes light signal input to Mr12Volt P2000 was weakened due to old devices, total length of fibre optic (FO) cable or there're too many FO connector added, hence causing the P2000 to malfunction or acting wierdly (crackling sound, disappeared in CD menu etc).
Rearranging devices order in the MOST ring sometimes may help.
Where to purchase Mr12volt MOST CarPlay interface:
www.mr12volt.c...