I think it's plausible, but my guess is it couldn't travel very far distances continuously, and it's probably far less likely than planet life.
Evolutionary pressures and the path of least resistance and all that means it'd only happen if it were the only option. So I think it's extremely unlikely planet life would biologically evolve it, but you could possibly imagine some meteor belt or constellation of nearby planets that gets stuck into some energy-exchanging feedback loops of some sort eventually producing life that relies on those loops.
It would evolve in a place that's already totally inhospitable to anything like the life we observe. Constant energy from stars combined with certain elements and processes could be enough, and maybe it could store electromagnetic and/or thermal energy in a sort of battery that also recharges slowly solely through star energy during travel. And it may only be able to travel between objects or regions that contain some elements it runs on, so maybe it could only travel back and forth within a chunk of its solar system.
I think life that travels between solar systems is a lot less likely, and between galaxies seems insanely unlikely, unless something like life can evolve at scales far smaller than anything we're aware of, e.g. if some collection of millions of neutrinos could somehow exhibit "lifelike" properties.
https://www.youtube.com/watch?v=XNK5oahmw3I discusses a theory that life could possibly form within stars at a sub-atomic level.
I think panpsychism is utter bullshit, but I wonder if life and perhaps to a lesser degree intelligence could be abundant in extremely bizarre forms and time and space scales that don't make sense to us. Maybe panpsychism is absurd but "kinda-vast-psychism" isn't. I'm guessing probably not, though, and that maybe there are some things like that out there but they're outliers and insanely rare.
