Seems to me there must be some kind of tracking or tethering involved in doing time travel or one can indeed get “lost” in time. Does this happen? Is it a known hazard?

You will not be lost because you will be in charge of what you are doing if you set about to travel through time. If an accident should happen, someone might come and rescue you who is following your progress but they would have to be along for the ride, they would not be able to see this coming in all likelihood. There are ways of engaging in prophetic vision to cover such contingencies but the question is whether it could be foreseen in time to make an alteration. This is an imperfect science because of the great complexity of what takes place, much of which is spontaneous and unplanned, particularly in a world of free will and free agency, so there will be unexpected passings because of sudden events which cannot be forestalled or headed off in advance to thwart them. This is no different than you in your ordinary life, you do not have someone sitting with a crystal ball pondering whether you will be safe that day to leave the house and drive to work and return home again. People simply take their chances and that is because this is all less serious than it seems on the surface, that most times a life has value but is expendable whereas the soul is not, and, in the end, it matters little how you come and go and when because any temporary loss or delay in your soul journey is simply that, and your journey will resume in due course in a new incarnation and with the myriad possibilities available to you, you will not greatly mourn a truncated life—there are simply too many exciting new things to try and experience to regret the past.