I have a 750/month 3BB Internet package and have lately had issues using my Android box (basically unusable due to buffring). I have had a look at my internet speed with Ookla (seems fine) but when I run Pingplotter I get another story. What does it mean when I have such a high packet loss on my private IP router address.

And are there more people out there with the same problem? I tink it started Monday or Tuesday (I live in south Pattaya).

I have same package as you.
Only use for phone alternative on laptop ( LINE and Whatsapp ) and general use.
Around 8 - 9pm, regular as clockwork when trying to watch a movie speeds drop and it keeps buffering.    This is especially true of movie sites with Thai subs but also affects other sites.
If I change browsers this sometimes helps.
I try to download earlier in the day, where such sites allow, and save to watch when I want to.