@Turuvang17
Thanks for the input
>... They seemed to tell me that I needed an L subscription and that switching off was standard with an S subscription which I have....
YES, that's exactly it, with fiber optics it's better to have an L Internet subscription in order to benefit from higher speed, as well as a certain stability
Advice:
1. For the laptop connect it with an Ethernet cable directly to the router to avoid WLAN outages.
2. Install a network repeater, for example a WLAN Box 2, it will allow better Wi-Fi coverage in the home network
WLAN-Box 2 and WLAN-Box - Help | Swisscom
>... A last question...can I change the Swisscom box to any other box???...
YES, it's possible of course, choose preferably the Internet Box 4, the most recent and powerful model, moreover it is specially adapted for the optical fiber, speed up to 10 Gbit/s and more in the future
Internet-Box 4: Router - Help | Swisscom
For a third party router Swisscom does not provide any assistance