Realise this may not be particularly reassuring but having been in touch with Moderators, this is the latest information on the LTE/Wifi problems some are experiencing.
Unfortunately the Developers have so far been unable to replicate the S10 LTE and Wi-Fi issues reported. The developers have requested CP logs ( this is due to the fact that they give more in-depth information as to just what’s going on with the signal). However those CP logs are too large to be sent by the Members app, Moderator @AntS has recently been informed that the logs cannot be collected by the Service Teams in the UK due to GDPR concerns. Therefore no sign of a ressolution at the moment.
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.