Although I have had my Vision upgraded to V3i - seems to me back before the the upgrade and early on (new then), there were a few times when I went to pinpoint a target I didn't get a tone. I think what was happening to me then, I was too fast on the trigger going from the Analyze, through Search, to Pinpoint (snapping from Analyze > Pinpoint). When it didn't go right, I would again analyze the target, then get the coil off the side, and while holding the coil still, , center the trigger (search) and pause, then pull the trigger for pinpoint, pause before moving the coil. The pause and on triggering while holding the coil still seem to do it.
Then again, I also had a couple time that when I was pinpointing, when I got the strongest signal, I would move the coil away from the target and it wouldn't drop off - even when I swung the coil way off the side, and when I raised the coil up waist high - like it was stuck until I released the trigger, and I was getting full blast audio that wouldn't lessen until I released the trigger.
I had done program resets, even pulled the battery pack during operation etc.
When contacting Whites, of course their first recommendation was batteries, but I had already been there, done that.
I had to have my detector sent back (with headphones - was having headphones issues sometimes).
But all this was on the early stage (Vision) and Whites dealt with it. They also replaced my headphones - I never did get told what the problem, but I never asked either.
When the problem first started, I had changed batteries (a few times), then changed frequencies and headphone channels, then tried a different areas (maybe EMI mix), and after a few quirks in about a month or so, I had no choice than to contact Whites.
Now the Vision was upgraded this past spring, but I really haven't put much time since. My time comes after the rains condition the ground, and the temps are more to my likings.
If you don't find what's going on with it, might want to contact Whites.