> Is it possible to establish both an infrastructure network and an ad-hoc
> network to run concurrently on a single set of wireless network
> components?
No. For many reasons, not least of which is there's only one radio on each
card/router.
And that's not how you'd debug your problem anyway. As has been suggested,
you've likely got interference with something else. Either some other
network gear is now on the same channel or there's something else causing
the noise. Search for other wifi networks, if others are present then move
yours to a channel different from theirs.
Wifi is unlicensed, it is possible to get into a situation where there are
too many access points (like an apartment building, dorm, condos, marina)
and no wifi will work because of it. If that's the case then it's time to
meet the neighbors and work out a plan. Sometimes it can be as simple as
using a lower power level on their routers (if it supports such). Or moving
it to another place in their dwelling. Sometimes it helps to use reflectors
to point the signal toward where it's needed and not elsewhere.
I'm guessing you've either got interference. Either that or the radio in
the MN-700 is starting to die. New routers are cheap.
I am in a residential neighborhood with several APs around me. I will try to change the channel to something else. I don't think it is the MN 700 because I am only having problems with this one particular application that is on two computers. All of the computers are functioning in terms of accessing the router and gaining access to the internet. File sharing is also not a problem on the network.