MacBook Air will not run on battery power post macOS Catalina installation
I have a MacBook Air (2012, 13 inch, dual core i7, 8Gb RAM, 512 Gb SSD) which has been faultless until I installed macOS Catalina. At first, when running on battery power, it randomly switched off as if there was an instantaneous loss of power. Since the update to version 10.15.4 the problem is worse and now if I disconnect the power cable even for an instant, the computer instantly switches off.
I've tried SMC and PRAM resets and neither has helped. I have heard that Catalina has introduced such random shutdown behaviour to many Macs, including new models.
This is desperate - I have a perfectly good laptop which I can only use tethered.
Could someone please suggest a fix or could Apple please redeem itself soon with a new macOS release that sorts these issues out?
Thanks
Paul
MacBook Air 13", macOS 10.15