Rejections

Is anyone else noticing a huge influx of rejections within the Electronics module? We would rarely get rejections and now it seems like I can hardly keep up and I have no idea what the issues are. I understand the issue with Blue Plus does not help but I am also seeing other payers rejecting and I'm wondering if there is an issue within Availity? I have created tickets for help but that seems to be taking foreverrrrrr. Example of a rejection - billing UMR for a client we have received payments previously and it appears most of the client claims are being accepted but a couple random ones are rejecting stating  "Acknowledgement/Returned as unprocessable claim-The claim/encounter has been rejected and has not been entered into the adjudication system. Status: Subscriber and policy number/contract number not found." Just feels like i'm going in circles in the electronics module.... Can anyone relate? Or help??