In a similar vein as the "no double beep" thread...
There's been a couple of times where the pod was extremely difficult to fill. I just force the insulin in with as much force as needed and have never had a problem with the pod working.
The last time it happend, I honestly felt like I wasn't going to be able to apply enough force with the syringe plunger, but the pod eventually budged, ever so slowly, and worked fine.
Today I changed my pod and it was difficult to fill. It beept twice and then I hit a stop. Forcing a bit more the insulin went in. Placed the pod on my arm and after 35 minutes a screamer on my arm "POD ALARM". Stopt the pod and took a new one. Why it happened I do not know. Tomorrow I will call Ypsomed to get a new one.