RAP and MAPs change the channel and Radio Role

I have a WLC 2504 with version AIR-CT2500-K9-7-5-102-0, LAPs are AIR-CAP2602E-A-K9
I set serveral LAPs for working in mesh mode, I set three Bridge Group Name, the first group has one Root AP and three MAPS working in channel 157, every MAP has a switch connected to its ethernet port.
the second group has 2 LAPs one Root and one MAP, all working in channel 48. The MAP is connected to a switch.
the third group has 2 LAPs, one root and one MAP, all working in channel 149. The MAP is connected to a switch.
The issue is the next:
At the beginnig every LAPs were associated to its bridge group and in the channel defined but suddenly all LAPs of group 1 move to channel 48 (second group) includind the ROOT AP. This happend after the switch that connect to the RAP was disconnect from LAN.
In order the associate once again LAPs of the first group to the channel I defined previously I connected RAP to the switch once again I notice the channel shown was 48 and in downlink role mode.I change to channel 157 reset the LAP and wait several minutes; after the first reset the RAP remains in channel
48 (it must be 157), I reset once again and wait severeal minutes. Finally the RAP was up and working in channel 157.
After this I reset the MAPs that corresponde to BGN 1 , after severasl minutes finally just one MAPs for BGN 1 was show in the correct channel and in the correct Radio role, I have to reset several times the other MAPs until they were shown in the channel I set previously and in the correct radio role.
I would like to know the reason the RAP and MAP move to a differente channel eventhough I define de Bridge Group Name in every one and the specific channel.
regards

Hi scott ,
Thanks for your explanation, very clear.
In my scenario every RAP connet to a switch where I define VLANs and specific VLANs are allow to pass. If RAP and MAP join to a different RAP (different BGN)
it will allow to pass traffic or maybe don't allow traffic I needs to . That's why I worry about the keep the MAPs join to the correct RAP and the RAP keep in the BGN and channel set previously.
is there any option to this avoid this issue?
Thanks a lot for your time
regards

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