After reaching the level to turn heroic, it softlocked & had no ads spawn (except for the ones to get the bloom). Showed 100% charged & timer drained/stayed at 0. This lasted for at least 5-10 minutes before I left.
If it just happened once then either you or someone in the instance had some significant lag and/or dropped packets. If you are seeing this happening at every instance of the Contact event you try, then it would imply you are having serious networking issues.