LGT-92-US915-LI - Issues receiving empty payload/data frames "EMPTY"

We just got a few LGT_92 GPS trackers,
invoice 10755461

We added the sensors into Loriot Cloud successfully, but the cloud is receiving EMTPY frames. We left these GPS trackers during the night yesterday and we found out that some data frames were having values, one GPS was showing 00 for LAT/LONG and the other GPS was showing values for the LAT/LONG as well as battery level. Then this morning these GPS trackers having sending data frames EMTPY again, we did not do any changes or moving the GPS to other locations.

Last data (10 latest records)

FCntUp Time Port Data
316 3 hours ago [ EMPTY ]
313 3 hours ago [ EMPTY ]
309 3 hours ago 2 05 32 8f f3 28 30 0f 6b 01 c1 1e 74
307 3 hours ago 2 05 32 96 f3 28 3b 0f 39 01 c9 1e 72
306 3 hours ago 2 05 32 93 f3 28 3c 0f 5b 01 ca 1e 71

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