Why won't my tv stay on?

Why won't my tv stay on?

We have a panasonic tv TY-LA1001 ELE3 and we can turn it on and it works. However after about 3 minutes the screen will go black and the green light will flash. After about a minute the screen turns back on and we can resume watching. This happens continuously and we've tried resetting it multiple ways. Anything may help so please any suggestions are beneficial! Thank you!

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