So, in the Sonos app on my mobile phone, I noticed a 15% discount offer in my inbox. It was valid through today. So this afternoon, after browsing the Sonos website, I decided to buy a Sonos Amp, but when I opened the inbox in my app on my mobile phone, the message was there but immediately disappeared before I could open it. Why would that happen? I checked it last night to make sure that I still had time, and it stated good through August 10 (today). Imagine my disappointment. I guess I won't be buying an Amp today. Have others had this issue as well?