The number of transfers is up across the board for D1 women's basketball, and the number of five star players based on college not HS performance transferring has blossomed over the last decade. It is not specifically tied to college record, coaching, minutes played, or any other factor that I can see, though each of those might be part of specific decisions of specific players. It appears to me to be a generational shift in attitude.
One aspect may be that there are more attractive options available to transfer to - Geno spoke about how he disliked taking transfers back in the early 2000s, because he didn't get enough time to work with them before they left. He took a few in desperation, but generally with disappointing results for both player and coach. Rita Williams - a JuCo transfer who played immediately and was at Uconn three years is probably the only real success story at Uconn in terms of impact. But, recently he has seemed much more open to taking transfers as he is also finding the transfer rate out of Uconn is also much higher. And the number of good programs with open doors to transfers has exploded. I can't name a single top 10, 20 whatever school that isn't wide open to taking transfers.
As Uconn fans, I don't think we can point to any other program and say 'whats wrong' without looking at Uconn and asking the same question - what happened to the class of 2021? 4 in zero graduating, 3 transfers and one turning pro. Geno may still be very selective in who he recruits, but it hasn't exempted him from kids transferring out.