@David-TP 

Thanks for Your reply.

The RSRP dropping occurs simultaneously with a change of band, which suggests that the dropping is caused by a band change. And I believe that a band change may be caused by a high level of interference and noise.

However, the connection has now been stable, without RSRP droppings or band changes for almost 30 hours and without rebooting the device. The bands used now are B3, N78. The signal values are: 

RSRP stable between -95 to -99 dBm

RSRQ varies between -11 to -16 dB

SNR varies between 3 to 11 dB but may occasionally be as low as 0 dB and even show negative values.

The connection seems to be affected by intermittent disturbances. I have tried to move the X50-5G device to other windows in the house to find the best place. Will an external antenna improve the RSRQ and SNR values?

  @David-TP 

After a couple of days I noticed a sudden RSRP dropping. It occurred simultaneously with a bend change from B3,N78 to B7,N78. My carrier is Tele2 Sweden.

How can I prevent the band change?

Below are two screenshots, before and after the RSRP drop

Best Regards