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Cell keeps updating on nrf9160

Hello,

We are doing some network quality tests on LTE-M with PSM off and notice loss on UDP between 0% to sometimes 15% on simple udp messages sent every 10 seconds from the server to a client running on thingy91.

We noticed that when higher loss occurs we get more events of LTE_LC_EVT_CELL_UPDATE. The cell keeps changing between few cells in the area, their description according to cellmapper.net is attached.

Questions:
1. Is it possible that cell changing can induce loss on packets coming from server to client?
Something like the packet is kept on the cell until the DRX passes and device checks every 1.28 s, but if device changes cell then packet is lost?

2. Is there any way to make the device stop searching?

Thanks

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