Ok, I found the logs:
Logs
Cloud Operation Logs
init set log level = 6
mqtt start!
mqtt init success!
Subscribe succeeded
Subscribe succeeded
[ 99.295985] do_page_fault(): sending SIGSEGV to gl_mqtt_service for invalid read access from 00000000
[ 99.296023] ra = 0040623d in gl_mqtt_service[400000+d000]
init set log level = 6
mqtt start!
mqtt init success!
Subscribe succeeded
Subscribe succeeded
[ 150.057881] do_page_fault(): sending SIGSEGV to gl_mqtt_service for invalid read access from 00000000
[ 150.057918] ra = 0040623d in gl_mqtt_service[400000+d000]
init set log level = 6
mqtt start!
mqtt init success!
Subscribe succeeded
Subscribe succeeded
[ 213.228651] do_page_fault(): sending SIGSEGV to gl_mqtt_service for invalid read access from 00000000
[ 213.228686] ra = 0040623d in gl_mqtt_service[400000+d000]
init set log level = 6
mqtt start!
mqtt init success!
Subscribe succeeded
Subscribe succeeded
[ 275.793106] do_page_fault(): sending SIGSEGV to gl_mqtt_service for invalid read access from 00000000
[ 275.793143] ra = 0040623d in gl_mqtt_service[400000+d000]
init set log level = 6
mqtt start!
mqtt init success!
Subscribe succeeded
Subscribe succeeded
[ 338.839130] do_page_fault(): sending SIGSEGV to gl_mqtt_service for invalid read access from 00000000
[ 338.839167] ra = 0040623d in gl_mqtt_service[400000+d000]
init set log level = 6
mqtt start!
mqtt init success!
Subscribe succeeded
Subscribe succeeded
[ 401.539104] do_page_fault(): sending SIGSEGV to gl_mqtt_service for invalid read access from 00000000
[ 401.539140] ra = 0040623d in gl_mqtt_service[400000+d000]
init set log level = 6
mqtt start!
mqtt init success!
Subscribe succeeded
Subscribe succeeded
[ 465.330774] do_page_fault(): sending SIGSEGV to gl_mqtt_service for invalid read access from 00000000
[ 465.330811] ra = 0040623d in gl_mqtt_service[400000+d000]
init set log level = 6
mqtt start!
mqtt init success!
Subscribe succeeded
Subscribe succeeded
[ 527.818833] do_page_fault(): sending SIGSEGV to gl_mqtt_service for invalid read access from 00000000
[ 527.818870] ra = 0040623d in gl_mqtt_service[400000+d000]
init set log level = 6
mqtt start!
mqtt init success!
Subscribe succeeded
Subscribe succeeded
[ 591.102344] do_page_fault(): sending SIGSEGV to gl_mqtt_service for invalid read access from 00000000
[ 591.102391] ra = 0040623d in gl_mqtt_service[400000+d000]
init set log level = 6
mqtt start!
mqtt init success!
Subscribe succeeded
Subscribe succeeded
[ 656.136177] do_page_fault(): sending SIGSEGV to gl_mqtt_service for invalid read access from 00000000
[ 656.136214] ra = 0040623d in gl_mqtt_service[400000+d000]
init set log level = 6
mqtt start!
mqtt init success!
Subscribe succeeded
Subscribe succeeded
[ 721.490426] do_page_fault(): sending SIGSEGV to gl_mqtt_service for invalid read access from 00000000
[ 721.490466] ra = 0040623d in gl_mqtt_service[400000+d000]
init set log level = 6
mqtt start!
mqtt init success!
Subscribe succeeded
Subscribe succeeded
[ 784.026070] do_page_fault(): sending SIGSEGV to gl_mqtt_service for invalid read access from 00000000
[ 784.026107] ra = 0040623d in gl_mqtt_service[400000+d000]
init set log level = 6
mqtt start!
mqtt init success!
Subscribe succeeded
Subscribe succeeded
[ 849.429448] do_page_fault(): sending SIGSEGV to gl_mqtt_service for invalid read access from 00000000
[ 849.429487] ra = 0040623d in gl_mqtt_service[400000+d000]
Like mentioned, it will show as available after a restart (can be repeated), but after a short while it will no longer be available. Not sure what the logs can tell us.
Here is a screenshot of the device when it was visible and the time: