My BDP-150 recently did the same thing. Would not turn on with the remote or by pressing the power button on the front panel. Had not used the unit in a couple of days. It only worked after unplugging the power cord for about a minute. Then it would turn on with the remote.
It does sound like a firmware concern. Since other models are experiencing this.
Twin Pioneer AVR Locomotives-Elite SC 97, SC 1222 7.1.4, DOLBY Atmos and DTS X, (Front Pre Out,) JBL Pro Synthesis LS Series Speakers, F L R-LS80, Cen-LS, S L R-LS60, SB L R-LS60, 4 Dolby Atmos Enabled Pioneer SP-T22A, JBL 12" Wireless Sub
Mitz 73740 DLP, Sony BDP-BX650, ATV G3, Yamaha ATS 1060 Sound Bar, True Depth Firestorm 2.0 3D Glasses, Harmony Smart Control with Touch Remote, EYE Pad Air, Winegard FL6550A