My main customer has recently violated his own payment terms. They payed two weeks later than their own terms and conditions allowed. They have also recently tried to push me to sign a new contract with conductions that are less favorable for me than before with no othe changes to compensate for that.
Today I talked to one of the project managers with whom I'm on first name terms. She told me a lot of suppliers had complained about late payments these days. So I asked her directly: "Should I be worried? Do you guys have financial problems?" (after all my economic existence largely depends on theirs)
She laughed hysterically: "Oh, god, no!" Apparently they are doing very well and being a dick to their suppliers is part of why they are doing so well.
They didn't get rich by writing out checks...