Yes, because it happens on recent hardware (a 6s) and other messaging systems don't seem to have this issue at all under the same conditions. Most of the time

Yes, because it happens on recent hardware (a 6s) and other messaging systems don't seem to have this issue at all under the same conditions. Most of the time it would work fine, but quite frequently messages would be sent (have left my device) but not appear on the receiving device for ages, so i can only assume that sometimes the infra couldn't keep up.