can you post how your tai/config.txt looks like?
i dont think its the vita dying, but SD card might be tho maybe or the sd2vita is not the best. because they are cheap stuff where its a lottery if you going to get a good one.
make it boot from the Sony memory card as default and test it like that, the sleep mode. its bit long but needs to be done.
Thanks for the reply mate, appreciate it - Copy pasting my config.txt...
# ITLS
*KERNEL
ur0:tai/itls.skprx
# YAMT
*NPXS10015
ur0:tai/yamt.suprx
*KERNEL
ur0:tai/yamt_helper.skprx
# This file is used as an alternative if ux0:tai/config.txt is not found.
# For users plugins, you must refresh taiHEN from HENkaku Settings for
# changes to take place.
# For kernel plugins, you must reboot for changes to take place.
*KERNEL
# henkaku.skprx is hard-coded to load and is not listed here
ur0:tai/0syscall6.skprx
ur0:tai/nonpdrm.skprx
ur0:tai/repatch.skprx
ur0:tai/PSVshell.skprx
*main
# main is a special titleid for SceShell
ur0:tai/henkaku.suprx
*NPXS10015
# this is for modifying the version string
ur0:tai/henkaku.suprx
*NPXS10016
# this is for modifying the version string in settings widget
ur0:tai/henkaku.suprx
# Optional QoL plugins
*KERNEL
# removes brightness and wifi restrictions for games
ur0:tai/NoPowerLimits.skprx
# increases max/decreases min brightness, disabled by default
# ur0:tai/vitabright.skprx
*main
# shows battery percentage near the gauge
ur0:tai/shellbat.suprx
# screenshots are png instead of jpg
ur0:tai/pngshot.suprx
Personally, I don't think it's the card cuz I just opened it fresh outta its packaging and its name brand (Lexar)
The sd2vita is something cheap from aliexpress but it has been running without issues for a year on another vita (a 2000 if it makes any difference)
As for issue... its just that one screen popping up on wake causing a reboot - apart from that, even if I am playing for a few hours straight - no error msgs at all... no random reboots of any kind...
Also - if I add the sony memory card back to this vita 1000 - I can sleep wake to my hearts content without any issues...
Ash