MBP 2014 Sequoia - severe freezes only on battery, random sleep, apps hang

Device and setup:

- MacBook Pro 13/15-inch (Mid 2014)

- macOS Sequoia installed via OpenCore Legacy Patcher (current release at time of posting)

Only on battery power, the system becomes intermittently unresponsive: spinning beach ball across apps (sometimes including System Settings/Finder), UI stalls, delayed input, and occasional total UI freeze requiring hard reboot.

Also, the machine sometimes goes to sleep/standby while actively in use (keyboard/mouse activity), and wake is unreliable. On AC power symptoms disappear.

What I’ve already tried

- Reset SMC and NVRAM/PRAM (multiple times).

- Updated OCLP to latest, rebuilt and reinstalled OpenCore to disk, re-applied Post-Install Root Patches.

Anyone have similar issues?