PMP_450 SM (lInk disconnecting every 1hr)

HI ,

We are using PMP_450 AP connected to almost 10 Customer ( Subscribe Module ),out of 10 , one of SM is disconnecting from AP and customer service dropping .

Note : uptime : 5day and seession time : is disconnectly frequently ( Ie .hr ), what may the issue .please advice .

Please post CNUT capture of AP and affected SM.