Hello Sir,
I appreciate your response. I thought I was the only one having these issues.
So I tried the same thing as you.
I have published some datasets for my field crew and they have been working(downloading/synching) without issues.
I had to do some changes to the datasets, I published a new one and it's been crazy. Everything has halted, no new offline maps. I was worried. My boss thinks it's me but I know it's not.
So this is what I did
I published an empty data set, same schema.
I still could not download the maps on Collector for ArcGIS(android).
But I could use the maps without downloading it.
So ESRI needs to check this out. Maybe there may be more of us.