ping times get excessive when upgrade to 15.1

15.0.3 - 10.0.60.100 is ap, 10.0.60.75 is sm, showing typical ping times

no change except firmware from 15.0.3 to 15.1, notice ping goes from about 23 average to sm to 200 ms average to sm

and going to 15.1.1 has a triple bad affect