OK, so using that software version number I found this thread at XDA-developers
which discusses software update packages for the Desire V. I should add that I've only quickly read through it, and a lot of the early comments are about the fact that it was originally posted in the Desire forum there or concern how to apply the updates to devices intended for different regions.
The first post links to instructions for finding a software update. However, that update seems to be exactly the software version you have! So I'm not sure there'd be much point following those instructions - it would erase your phone, but chances are it would leave you with exactly the same software you already have and hence may well not solve your problem.
Post 64 includes what looks like a link to a ROM Update Utility for a newer version of the HTC Asia ROM - since the first post in that thread describes an HTC Asia RUU with your software number I assume that this is the correct regional variation for your phone (if you want to apply an RUU intended for a different region you need to indulge in some trickery). So if you want to try a manual update that would be my best guess from what I've seen there.
Please note that I've no familiarity with this phone at all, nor with the sources these guys are getting ROMs from (the site I normally use for HTC update packages doesn't seem to have a section for this phone, unfortunately). This is just the result of my doing a bit of web searching.
If you decide to try this, what I'd recommend is simply downloading the package, which should be a windows .exe from the file name, connecting the phone to a PC via usb and running the .exe on the PC. It should check whether it is intended for your device and refuse to run if not. That would be safer than the sort of thing that people in that thread are discussing. But do back up vital data first, because if the update runs it will erase everything on your phone in the process.
The alternatives would be to live with the problem, or to ask for advice in that XDA thread, since people there do at least seem to own this device.