Try logging into the router and changing the wifi channel that your wireless is using. I had problems with mine clashing with other nearby transmitters (next door's wifi, the tv video sender etc). Works fine now though. If you're not sure how to do it, call 150 and they'll either talk you through it or do it remotely for you.
Can you try a pin hole rest of the modem and also go in to the advanced wireless settings and check that the SSID broadcast is ticked.
If this dose not resolve the fault can you call in and we can run some tests
Michael Bradley Help & Support Forum Team
If someone's helped you out say thanks by clicking on the Kudos Star. If someone's solved your problem, why not mark their message as a Helpful Answer? You can also help other users find useful posts by Tagging them with keywords.
If you are new to the forum, please remember to search the forum before posting your question. Please don't send private messages directly to the forum team unless they ask you to, post your issue to the forum first.