I was able to get in touch with AcuRite via Facebook and they were very responsive through messenger. I can't say enough about that process, it worked very well.
Bottom line: This is an issue effecting a small number of 5 in 1 station owners. The only fix is to replace the 5 in 1 unit. If the unit was less than a year old, I believe they would swap it out. Since mine are over 1 year old, no luck on that. They did offer me a 15% discount should I choose to buy a new 5 in 1. For now, I'll elect to keep an eye on things and see if it gets worse.
I did ask about a fix; swapping out the internal board. Unfortunately, that won't resolve the issue, hence the need to replace it.