I think I experienced exactly the same issue just now, and after some attempts, here is a possibly working workaround (not a good solution though): replace the background.service_worker with background.scripts in manifest.json, like:
{
...
"background": {
"service_worker": "background.js"
},
...
}
replaced by:
{
...
"background": {
"scripts": [
"background.js"
],
"persistent": false
},
...
}
I tested several times, the listeners registered in background.js can always continue working after RAM usage reaches 80%.
Lucka
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