The Conservative party has held power since 2010 but since 2016 now 4 prime ministers have resigned for various reasons.
David Cameron resigned in 2016 because he was against the UK leaving the EU and Brexit passing was seen as a failure.
Theresa May resigned in 2019 because the party saw her as unable to win the next election and unable to negotiate an exit deal with the EU.
Boris Johnson resigned a few months ago because of a scandal involving one of his ministers.
And after 44 days Liz Truss resigned after her unpopular tax plan failed.