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Amplifiers are supposed to increase the amplitude of the desired signals. That sounds like a good thing but you can have too much of a good thing.
Amplifiers also increase the amplitude of the undesired signals and noise. Also, amplifiers (even very very good ones) generate noise which is added to the existing noise. Finally, amplifiers (even very very good ones) distort and mix signals together.
This last phenomenon is probably what is happening in your case... If an existing TV or FM station increased their signal strength in your area or a new TV or FM station started operation, your amplifier is now overloaded and is mixing all of those signals together into a noisy garbled mess that your tuners can't make sense of.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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