AR Series stop working

014631009919354
(For testing, It is currently addressed to GPS-TRACE)

014844000030267
(This device is from my brother-in-law, it is in another account.)

These 2 devices stopped transmitting on December 6, yesterday December 11 they transmitted intermittently between 11:00 and 19:40.
Today they continue without visualization on the page.
I debugged on one of the devices and the gps-trace server is responding to the ACK message for UDP transmission but it still cannot be seen on the map.

The hours are GMT-4

EDIT….
I see format changes in the last message received in the toolbox

{“app_ver”:“2.0.9”,“assembly”:12289,“backup_pwr”:4247,“baseband_ver”:“2.0.3″,“channel.id”:13670,“device.id”:463169,“device.name”:“AR Series”,“device.type.id”:172,“event”:24,“gpio_dir”:253,“gpio_status”:13,“ident”:“014631009919354:21126”,“io_ver”:“255.255″,“main_pwr”:13640,“odometer”:2274718,“position.altitude”:84,“position.direction”:270,“position.hdop”:3.3,“position.latitude”:-37.798228,“position.longitude”:-72.70804,“position.satellites”:4,“position.speed”:11,“protocol.id”:39,“rev”:1,“rssi”:18,“seq_number”:36986,“server.timestamp”:1576096915.172225,“timestamp”:1576096911}

{“app_ver”:“2.0.9”,“assembly”:12289,“backup_pwr”:4310,“baseband_ver”:“2.0.3″,“channel.id”:12368,“course”:0,“device.id”:463169,“device.name”:“AR Series”,“device.type.id”:172,“event”:15,“gpio_dir”:253,“gpio_status”:12,“hdop”:0.8,“ident”:“014631009919354:21126”,“io_ver”:“255.255”,“main_pwr”:13320,“odometer”:1998398,“protocol.id”:39,“rev”:1,“rssi”:18,“sat_count”:9,“seq_number”:261,“server.timestamp”:1576157745.885315,“speed”:0,“timestamp”:1576157251,“x”:-54.182872,“y”:-32.791688,“z”:420,“delimiter”:true}

Last message format
“x”:-54.182872,“y”:-32.791688,“z”

All previous messages format
position.latitude":-37.798228,“position.longitude”:-72.70804