I'm not getting paid by anybody.
I am just tired of reading threads like this acting like the sky is falling. Making a bigger deal of this than it is.
Some have cracked mounts, some don't, not one single instance that I or anyone else that has chimed in on the subject of a motor breaking off during flight. Not even a partial break/wobbly motor observed on landing or post flight inspection.
DJI phantom quads have worse cracking around their mounts, and same thing, no reports of motor separation. DJI has been in the game longer.
Is it a problem - Yes. Is it a ground all Q500s until something is done about it - **** no. Is it something that Yuneec needs to take seriously - Yes, and they are. Don't expect a free replacement frame section, or paid upfit if you send yours in to have something done about it. Certainly don't expect a refund.
If a person has an issue with the cracking frame mounts, then craigslist your quad, and go buy another brand. If this is the make or brake issue on if they are going to buy one, then don't.
Mine did a nasty aerial landing in a tree last month, then upon extraction, took a 50' fall and landed flat on her back, breaking the second of two CF props on it. I had the cracked rubber grommets, not sure if I have any frame cracks, but I know I have one motor that now has shaft play. Motors are still firmly attached. This is why I am not concerned. I have a motor with shaft play, a repaired gimbal mount, and a broken belly (crack across the underside between the gimbal and the mid section). Warranty is expired now that I crashed it, and it is still air worthy.