900 losing signal

i’ve got a 900MHz SM that seems to be having trouble ever since the 6.1 firmware upgrade.

MRTG shows that the SM doesn’t significantly stay connected during the hours between noon and midnight, but then it’s connected fine all through the night until noon the next day.

jitter value fluctuates between 1 and 4, and rssi is cinsistently around 1600 with only the offline times showing a drop off.

the antenna was working perfectly on 4.2.3, but since 6.1 it’s been having this trouble. neither the AP nor the SM were moved at all.

anyone have any suggestions?