App to monitor/alert lost WAN connection?

[macstatic]

I've been experiencing unstable Internet access from my provider (cable-modem with cabled (Ethernet) connections in our home) which means that the signal is lost, the reappears perhaps half a minute later. The cable modem LEDs flash, indicating a lost connection, so this is most likely a problem outside of my control. I alerted the cable provider which said they should look into it, but the problem is still there.
But to make troubleshooting easier, is there a Mac app I could use which will do the following:

a) alert me (i.e. by playing a sound and/or show a pop-up message)
and
b) log the time/date of when the WAN signal has been lost and when it's back again

I'm on MacOS 10.14.6 (Mojave)

 

[Bigwaff]

I’ve used PingPlotter in the past for similar purposes -

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www.pingplotter.com

 

[macstatic]

Thanks. I've just downloaded and started it up, but I'm unsure what to enter in the "Target" field.
Should I look up the WAN IP number for my computer (I have two instances of the IP widget which can access at any time from a desktop Space along with my other widgets. I've also just learnt (Find your IP address on a Mac) that I can enter the following in the OSX Terminal app:

curl ipecho.net/plain ; echo

So is it simply a matter of entering that WAN address in the "target" field and let it run? And if the connection is broken it'll tell me and log it?
I see it's a trial version, and the website says you can choose between "Free", "Standard" and "Professional", but I see no such option. Perhaps it runs in trial mode for 14 days, then asks you to decide?