I have had one for 2 years now and no problem. I do notice when the battery gets to half strength that it does take a little while to acquire. Other then that no real problems.
Are you in WAAS mode?
Just the Legend does have a slight rep with a weak signal. On mine in the woods I may have only maybe 7 or 8 Sat. I also have the Legend Hcx, no problem whatsoever with that one even with the battery at 1/4. In fact using both side by side on the Hcx I get 12 Sats compared to only 8 on the Legend.
Garmin is great to deal with. I would call them back. I know a couple folks having issues with theirs and sent it back to Garmin and they replaced it. Depends maybe on the problem.
Earl