An office repair was a bad suggestion. The better one was to remove add-ins in any program running or to try the problem in safe mode. If safe mode or disable add-ins works then you could logically say something that was added in was the issue.
But please don't just suggest office repair. That can add thousands of changes into the issue and really truly muddy the water before more focused trouble shooting is done.
Start with other programs running, run one thing at a time and don't "assume" the issue is inside office. A repair is not something that should be suggested as an early troubleshooting step.
As it turns of the issue is a known bug with Skype Point-to-Click which is apparently hooking the paste function.