HTM loss its prediction ability

Hi, Jacob,
Thanks, Yes, indeed, the time is meaningful to the data. We can easily find the periodic waveform from the image, In effect, one cycle is just a day, as the records generated every half an hour, so 48 records together make up one cycle.

Thanks for your patient and detailed response, thanks sincerely.
I have learned much from your answers. But I am still in puzzle about the question below, if you will give me a hand, I will appreciate it greatly.

Thanks.