Strange issue with aimesh

Main router: GT-AC5300
Aimesh node: RT-AC86U

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Interference Level: Acceptable
Mode : AP Only

DFS status: state In-Service Monitoring(ISM) time elapsed 494400ms radar channel cleared by DFS channel 108/80 (0xE26A)

Channel Information
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Channel 100 A Band, RADAR Sensitive
Channel 104 A Band, RADAR Sensitive
Channel 108 A Band, RADAR Sensitive
Channel 112 A Band, RADAR Sensitive...

Strange issue with aimesh