Does the problem persist if you disable the new MQTT flag (flag 3)?
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Debug:API:GET of api/pins
Debug:API:GET of api/info
Debug:API:GET of api/logconfig
Debug:API:POST to api/cmnd
Debug:CMD:cmd [loglevel 4]
Debug:CMD:loglevel set 4
Info:MAIN:Time 128, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Debug:API:GET of api/pins
Debug:API:GET of api/channels
Info:MAIN:Time 135, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Debug:API:GET of api/info
Debug:API:GET of api/pins
Debug:API:GET of api/pins
Debug:API:GET of api/channels
Info:MAIN:Time 139, free 96664, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 140, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 145, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 150, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 154, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 157, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 161, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 165, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Debug:API:GET of api/info
Info:MAIN:Time 169, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 170, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 174, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 175, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 179, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 180, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 184, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 185, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 189, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 190, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Debug:API:POST to api/cmnd
Debug:CMD:cmd [logfeature 9 1]
Debug:CMD:logfeature set 0x01FFFFFF
Info:MAIN:Time 194, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 197, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 200, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 204, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 209, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 210, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 212, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 217, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1
Info:MAIN:Time 218, free 105344, MQTT 1, bWifi 1, secondsWithNoPing -1