Very high turnover of staff is always indicator of very bad t&c.
I think SAIL were very lucky to start the operation after Monarch bankruptcy.
However now with base in Malaga I don't see anybody who would be interested to work for them.
Only option would be very low hours guys straight after flight school, but they ask for min 500h on a320, so it doesn't work for them neither...
The main question is how much longer they will try to keep it working?
Another thing is why they don't even try to raise the t&c?