Update: Looking at the opera://crashes page, I have noticed that the crashes are not entirely random, as they tend to (but do not always) occur in exactly two-hour intervals. It looks like the culprit is some sort of a periodic request that sometimes results in a crash. One suspect is the Google News page (https://news.google.com), as it is always sitting there in an open tab whenever the browser is up. In any case, I have also had the Google News page sitting open in Chrome, and there were no crashes, so this is specifically an Opera issue.
Here is the recent crash history:
Crash from Saturday, August 13, 2022 at 4:39:20 AM
Status: Uploaded
Uploaded Crash Report ID: Discarded=1
Upload Time: Saturday, August 13, 2022 at 4:39:25 AM
Local Crash Context: da438090-fc7f-4da5-8457-8570ba8cf6a0
Crash from Saturday, August 13, 2022 at 2:39:16 AM
Status: Uploaded
Uploaded Crash Report ID: Discarded=1
Upload Time: Saturday, August 13, 2022 at 2:39:21 AM
Local Crash Context: 8c9b4b0a-db58-4459-80b1-f0922e182fe0
Crash from Saturday, August 13, 2022 at 12:39:15 AM
Status: Uploaded
Uploaded Crash Report ID: Discarded=1
Upload Time: Saturday, August 13, 2022 at 12:39:21 AM
Local Crash Context: e694bd9b-955e-4bb9-9c33-c5169efbb378
Crash from Friday, August 12, 2022 at 3:13:06 AM
Status: Uploaded
Uploaded Crash Report ID: Discarded=1
Upload Time: Friday, August 12, 2022 at 3:13:11 AM
Local Crash Context: 761773ca-7a8a-4108-b263-db9d63a3c404
Crash from Thursday, August 11, 2022 at 10:10:28 PM
Status: Uploaded
Uploaded Crash Report ID: Discarded=1
Upload Time: Thursday, August 11, 2022 at 10:10:33 PM
Local Crash Context: fc03da11-e40f-4594-a20e-5553907b06ad
Crash from Thursday, August 11, 2022 at 8:10:22 PM
Status: Uploaded
Uploaded Crash Report ID: Discarded=1
Upload Time: Thursday, August 11, 2022 at 8:10:27 PM
Local Crash Context: c3109a4a-bcf0-49da-b1df-5992fc704524
Crash from Thursday, August 11, 2022 at 6:10:17 PM
Status: Uploaded
Uploaded Crash Report ID: Discarded=1
Upload Time: Thursday, August 11, 2022 at 6:10:22 PM
Local Crash Context: 44313893-5e73-4481-8123-013dc00a7a06
Crash from Thursday, August 11, 2022 at 4:10:15 PM
Status: Uploaded
Uploaded Crash Report ID: Discarded=1
Upload Time: Thursday, August 11, 2022 at 4:10:21 PM
Local Crash Context: d3e15031-7e3c-4ce2-9020-bc3ca2632072
Crash from Thursday, August 11, 2022 at 12:41:39 AM
Status: Uploaded
Uploaded Crash Report ID: Discarded=1
Upload Time: Thursday, August 11, 2022 at 12:41:44 AM
Local Crash Context: 96313f56-a415-4d5d-92cd-989f48d29e24
Crash from Wednesday, August 10, 2022 at 10:41:35 PM
Status: Uploaded
Uploaded Crash Report ID: Discarded=1
Upload Time: Wednesday, August 10, 2022 at 10:41:41 PM
Local Crash Context: 1c42ee28-7a2a-49e3-a0f6-da3082416dea
Crash from Wednesday, August 10, 2022 at 4:57:08 PM
Status: Uploaded
Uploaded Crash Report ID: Discarded=1
Upload Time: Wednesday, August 10, 2022 at 4:57:13 PM
Local Crash Context: ce730814-f426-4798-9297-ed331a2bef30
Crash from Wednesday, August 10, 2022 at 1:42:38 AM
Status: Uploaded
Uploaded Crash Report ID: Discarded=1
Upload Time: Wednesday, August 10, 2022 at 1:42:43 AM
Local Crash Context: 8368ea7a-4ce9-46df-b4ec-3f9b7a73db0b