internet drop outs

My home internet has suddenly begun dropping out for multiple minutes at a time. It has progressively gotten worse.

It is not Wi-Fi. It is all internet services. We have 2 PCs that are hard-wired into the router/modem and they lose internet as well.

Last night it happened 8 times during a 3 hour period. One of the drop outs was almost 10 minutes long.

My payment is increasing $25 next month. I pay for 800MB down, the drop outs are unacceptable. Any help would be appreciated