wifi keeps timing out

[tigerstyle]

Annoyed at this, router used to be fine (2Years it's been ok) the channel isn't busy, checked it with inSSIDer, but it keeps doing this:

No idea why, when connected via ethernet it's fine, but need the wifi to work too. Have 3 laptops and 3 android phones connected to it, is fixed IPs going to help? Or is that a hassle to set up should we then take our phones out to connect to other wifi networks?

 

[tigerstyle]

Thanks for the advice, been fiddling with this for the last few days now.
It's an IPTime N704M

It's the same over three machines, channel is empty, rest+upgraded router firmware.

Now it looks like this, I'm thinking is that roughly acceptable for what wifi is? Or should it be 100% constant? I don't game on this connection (would be on ethernet if I did) But I've an inkling it should be 100% Within site of the router sat here nothing in the way no microwaves/hairdryers/lead walls in the way!