My opponent was playing Heliod Company and put hundreds of triggers onto the stack during both my turn and theirs. They used up their timer, and once that ran down, the client started using my extensions to resolve their triggers. Then it made me skip part of my main phase (I had two copies of Devilish Valet and would have been able to deal enough damage to kill them, even at their high life total). This was a very frustrating experience.