I recently switched from SMTP to HTTPS for Platform Notifications. This transition happened about a month ago. However within the past few hours I've noticed something unusual that I haven't seen before. I'm noticing that a significant number of notifications (maybe around 20%) are truncated at close to around a size that is a multiple of 16k though it isn't exact. It doesn't appear to be caused by special characters since it will happen in the middle of regular eBay generated content. This prevents me from fully consuming it as it is not valid SOAP.
I haven't changed anything recently but my listener is behind an AWS application load balancer, and Apache server running PHP 7.4. All instances became impacted at the same time. However there's no way for me to know for certain if the issue is on my end or eBay's. Is anyone having the same problem? Or is it possible there's a problem at the load balancer level or something with my Apache/PHP settings?