Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 6 months life expectancy

Purchased and installed about 6 months ago. Stationed overseas so Vonage keeps us sane. The service has been great but the phone died. After troubleshooting with Vonage over the landline phone, they determined the power supply was bad (the plug that goes into the wall). They said they would replace it. 1 month later, no plug. Called and they said they didn't show it was ever mailed. Said they would mail (again). After another month, no show. Took plug to electrician friend, said plug was fine. We took the box apart and the circuit cards were corroded with a white powder which he said was an indicator it got wet or was in a very humid environment for some time. Probably sat in warehouse months before shipping out to us. Ordered Linksys Phone Adapter which uses regular house phone and been gravy ever since. Should have known better, and linksys was cheaper.