have noticed all weekend that units are being dropped from calls across the board.. Not just medical. But mission showing patients such as active shooter, i have sent Ambulances and go back later and none are there and mission says still needed. Same with various fire equipment. Sent Battalion Chiefs only to go back and see they are not there and still needed for mission
if you do use rescue ambos - that might be the issue - many in my alliance have had this and I have reported to devs and game mods