Star Trek: 10 Terrible Ways To Time Travel
7. Temporal Transporter
Judging by this and another entry on this list, it doesn't seem like they've quite ironed out all the kinks in time travel by the 29th century. Perhaps, if they spent a little less time naming temporal paradoxes and a little more working on the transporters, they wouldn't have all those former/current/future captains to arrest.
Pop quiz: What causes a chroniton flux of .003? Answer: It's the last traces of the crew of the Timeship Relativity, an (all is not) Wells-class vessel, beaming you from seemingly wherever and whenever they like. The Relativity was helmed by Captain Braxton, the one who gets the "for crimes you're going to commit" treatment. His future self had been dipping into Voyager's timeline trying to destroy it.
Never mind the headaches (but probably those too), this molecule-mixing method of time travel will give you debilitating sensory aphasia before it causes full-blown 'temporal psychosis'. Lieutenant Ducane warned Seven of Nine as much. If, whilst your back in the past, you encounter any interference that affects the transporter lock, you might also find yourself dead on the other side of the temporal threshold, only to be recruited again for the third time, which is most definitely not a charm… ay!