Wrt1900acs v1 snapshot wifi issue since build r13881-bae4204e34

Something changed since build r13881, my wrt1900acs gets wifi connection issue with snapshot build since then, even the latest today.
wifi connection freeze, have to disconnect and reconnect to make it work for a while.
a lot more of message like this than before "kern.debug kernel: [ 6208.149755] ieee80211 phy0: Mac80211 start BA"

Am I the only one experiencing this issue?