@Denise175 wifi signal strength should not have changed in the last couple of days unless you have moved the hub or devices or your neighbour's network is causing interference. While you can get boosters from Sky but they will charge you for them as they only come as part of a extra package like WiFi Max see https://www.sky.com/help/articles/sky-wifi-max.
If you think the issue is interference then rsboot your hub which should make it find the least congested channel. Also check the broadband speed to your hub in the service checker in the My Sky app.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
