Mythanatos:
If you are using Android based system then learn how to reset the Advertising ID.
if you are using Apple... iOs got rid of the Ad ID. so now you just have to restart the app multiple times. Can sometimes help things out by turning off ad tracking. Sometimes it helps by turning it back on. Apple and ads are a bit of a mess right now.
On Apple devices go to settings/privacy/Apple advertising and turn off Personalized Ads. Since i did that I can watch all 75 ads without ever having to restart the app.
Doing this also gives you this message, (Turning off personalized ads will limit Apple's ability to deliver relevant ads to you but will not reduce the number of ads that you receive,) It appears with Apple trying to deliver ads relevant to you actually limits the number of ads you can get at one time. (edit)
I tested it again and I was able to watch all 75 ads in about 20 minutes or so and only restarted the app once and I probably didn't need to restart it then,