In the premier league there is a new trend developing to sack more coaches. The BBC had an interesting article about this topic. When you choose a club y as a player you also have to consider the stability of the technical staff. Because an other coach often means a different way of playing. Because the current results were not according to the pending expectations. Ths can mean also a different line-up and this can mean that certain players will lose there starting position and get benched and sold eventually.
See included the link to this interesting article: article Dangerous places to coach England