Not quite a necro thread, so...
I use three of these switches; two at work, and one at home. All three had capacitor failures, intermittently causing the same almost-but-not-quite-booting condition you described. In one, the six 1,000uF 16V failed, and in another, both 1,000uF 6.3V caps failed. The third switch had only 2 caps fail, both 1,000uF 16V.
I'd strongly recommend that you schedule time to replace at least every 1,000uF in that switch, because they all have the same run time, all had the same amount of heat and stress applied, and they're all the same Teapo brand. The fact that 'Teapo' rhymes with 'cheapo' is
not a coincidence.