I am experiencing problems with wireless connectivity with my netgear DG834G.
These devices are getting on a bit, at least by the standards of today's throwaway society.
In the past 5 years or so I have had gone through two DG834GTs and a (related) GS608 switch. All became intermittent after two or three years and then died. Post mortem showed cause of death in each case to be leaking capacitors, easily spotted by the bulges. Capacitor failure is exacerbated by heat, so failure in the first hot spell of summer is consistent.
Your's may not be the same, it could be interference in channel as described, or something else. But you may want to take the lid off and look for bulging caps. Easily done, just prise off the four rubber feet to reveal the screws. If the capacitors are looking distressed, it may be time to invest in a new router.
If you need to know what a bulging capacitor looks like, your favourite search engine will bring up examples.
- edited (twice!) to correct typos, gotta stop posting from the iPad.