I've been ordering from zenni since 2008 or 9.. dozens of pairs.. no issues, even with (eventual) disregard/mistreatment of the frames.
In Nov 2021 I purchased two pairs, both frames formed stress fractures around the lenses and fell apart within weeks.
Both were full rim plastic, different styles. Standard lenses.
Zenni are replacing the frames.
I don't think the lenses caused the issue (shape/edging).
Their quality may be on the decline, or maybe it was just a faulty batch of plastic.
Please post if you've had a similar experience with zenni frames.
I will update if the new frames do the same..
Not with Zenni but I have had it happen with 2 pairs of glasses from different brands over the years.
A one off could just be a faulty material or a manufacturing flaw. If it happens again I'd say there's a QC issue.