3.7 wave still problems with rb600

hy

we have upadate to 3.7 on our routeroard 600
he has 3 wlan interfaces 1 for point to point , 2 for ap mode in 2.4 and 5ghz
die board works an about 10 to 20 hours all pppoe interfaces became latence time about 1000ms and more - sometimes ist will be in about 5 min. better - but sometimes the board will crash - no interface can be reached
we have roterboard firm 2.13
on the system we have about 50 pppoe clinets on the 3wlan interfaces and on 1 eth interface. ( authentification with radius)
the cpu load ist goint from 20-30% to 100% and toggle down to 20% then 60 then 100 and so on …


pleas help

please make a supout.rif file and send to support