I just had another incident of DIT credit limit not releasing. My bank is WF which had an outage yesterday, so it's probably due to that. My 2k of CFP billpays did post yesterday as well and that amount got released for CL.
Last time I had CL not release, it was 7 months ago, I called and they had me on a 3-way call with WF to confirm the payment cleared, and manually released the limit. This time I'll just sit it out, not worth the risk.