Yvm102 and Yvm105 is an issue with the EE boxes, a bug that is never fixed and requires a full reboot of the mini box to get it working again. Usually it happens when you turn on the box after not using it for a while, but sometimes it happens whilst watching. Having to reboot is not a good enough response if that is what EE tells you, having to go through full reboot routines every time you want to watch a TV is not something to live with.
The power or speed of your WiFi seems irrelevant from my experience. I've had it happen to a mini box 3.5 meters direct line of sight (opposite sides of a kitchen) from an EE Smart Extender with over 100mb speeds.
The only fix for these kind of issues solved by reboot seems to be for EE to send you either a powerline adaptor (if that works on your electric circuits) or another smart extender - and using LAN instead of WiFi. Even over LAN this error may still occur occasionally, but it is far less often.
My personal opinion is that EE should be shipping Powerline adaptors by default for this problem because it is so common until it is fixed.
