Restarting when change network mode from gsm to lte

[AmAn5]

When xperia z5 premium dual restart every time i change network mode from gsm to lte or from lte to gsm from sim 1 to sim 2 this seems very cheap for this premium phone please do provide us that update which do not restart on doing so because c4 dual doesn't do this

[MarlonUk1]

did you use the same simcards with the C4?

can you trying using other networks simcard?

apparently there are some netwokrs that triggers the restart when switching bands,.

does this happen when you are on safe mode?

[AmAn5]

I use same sim card in c4 too i tried in safe mode too z5 p do the same restart procedure

[Bhushan17]

I am facing same isue with two different operator's SIM. It restarts even if we change data from SIm1 to SIM2