I've been told by a contractor that the code they've written (which is causing errors) is tied to a known Saleforce limit where a record may have a maximum of 5000 activities associated with it. And that due to our dataload exceeding that limit, the SOQL statement in the class is failing.
I cannot share the actual class (NDA) but I'm more interested if anyone is aware of this supposed limit or how it could effect a SOQL call? I can't find documentation referencing such a limit anywhere on success.salesforce.com and I'm trying to determine just how legitimate the claim is.