Hi,
as the other user explained, ever day after a reflow is a chance. The first thing it’s for, ultimately, is just back up your data. The reflow job is not a profesionnal repair and offers no garantees of durability. A short period of the phone working, some days or some weeks, before dying again is documented. It doesn’t mean that it’s a failure.
as for Odysseus, i’d advise first going to recovery and try to wipe cache, then fastboot and try to access the system. It may be a software issue.