So I was happily fishing at Fools Falls, and barely gained 2 levels before I had to go afk for 10 mins, so I just sat there stealthed with my fish rod out. I came back and cast.. but then got "The fish sense something amiss. Perhaps it is time to try another location."

Is this a normal message to get after fishing for a particular amount of time, or is it because I paused fishing whislt I went afk, or something? I've seen other people say they fished 5 levels or more at a sitting, and I had done nowhere near that much. Why did I get this message?

And on another related note, where would be a good spot for me to move to now at level 24? I only really want to fish to 25 before going to pick up the next quest, so it's annoying I couldn't keep my fools falls spot!