Your solar inverter is likely shutting off due to a safety mechanism triggered by grid instability, excessive heat, or an internal fault, and you should check its error display or consult a professional if it persists.
A 100W panel rated for 100W at 77°F will only produce 70-80W on a 95°F day, and that's normal. The fix depends on whether output dropped suddenly (usually fixable) or gradually (age-related degradation). Here are the eight most common reasons solar panels underperform, with.