Failing to extrude mid-print

I’ve got an Ender 3 V2 that’s recently started failing to extrude after about 15–30 minutes of printing. The failure happens at different progress points, even when running the same file.

Here’s what I’ve tried so far:

• Switched to a known high-quality filament that has worked without issues in the past
• Checked for clogs and replaced the nozzle
• Replaced the extruder (the old plastic one had a small crack, so I installed a new aluminum one)
• Re-sliced and re-uploaded a fresh G-code file

Nothing else has changed on the printer besides the new extruder. OctoPrint shows the nozzle temperature holding very steady throughout the failed prints.

Any ideas what I should check next?