FT8, an update

Since FT8 was unleashed on the amateur radio community last summer I've made many contacts using this mode. However, in recent weeks I've noticed an increase in the number of failed QSO's, i.e. where a QSO fails to complete with the '73' exchange and can be logged as a valid QSO. In many cases contact is established with reports exchanged but then an almost endless cycle of RRR's are sent without reply causing me to cancel the QSO and start again.

This is something that is happening increasingly and I would be curious to know if this is something other users of FT8 are experiencing. Given the number of lost QSO's I seem to be experiencing I wonder if it's a mode worth staying with..?