It's like the mechanic: "This guy brought me this car, and says there's something wrong with it." Then he asks his buddies, "how do I find out what's wrong?" His buddies say "ask the owner, they can tell you..." - so, the only useful answer here from us at this point is to find out what the problem is before you can "fix" this unknown issue.
In any case, those V1910 switches are rebranded 3Com tech - they are not very forthcoming with information if something is going wrong. They are the cheaper business line units.
Honestly, I would just export the configuration, reset it, plug into each port individually and perform some tasks like large file transfers, video streaming, chat sessions, etc. and keep an eye on the logs in the console.
If they can't tell you what's wrong, how can they expect you to fix it?