Unlike many, I've always been OK with their slow pay. I'm all about keeping my receivables as high as possible, and they are consistently my #1 or #2 MSC each year for overall income, contributing greatly to that end.
Now it looks like they are paying in about 2.5 months instead of the typical 3+ (and having to chase them at times).
Yeah, that got a bit old. It has not been an issue for awhile, and I solved it by going straight to one of the owners. She and I have a great relationship, and she throws me quite a few special projects each year. Bonuses have been huge of late, which is good, because I'm now out of rotation for a large chunk of properties in my area.