smeezekitty wrote:I had touched the input lead at one point so that's why I suspect ESD.
Most discrete MOSFET devices are fairly well protected from ESD these days but it still is wise to take precautions. That also applies to CMOS and all other varieties of static-sensitive devices.
I know I bang on about this seemingly endlessly, but supply decoupling/bypassing is essential. Even if you've only got 30cm (12") of wire from the PSU to the application, add the supply caps. Even without zapping chips or discretes through handling, they're still at the mercy of cool and low-humidity conditions. that's Europe and the US at this time of year. Thunderstorms...another subject. (I'm in the tropics).
The gates to static-sensitive devices can be protected externally depending on the application. But as you assemble the final circuit you need to be careful.
It might be worth investing in an wrist-earthing/grounding strap, I haven't, but maybe where you are it's a good insurance policy. Make sure your soldering iron is properly earthed/grounded as well...in this case mine is...
https://www.amazon.com/earthing-bracele ... g+braceletMany, many others out there too...
Steve A.