Auto-advance block with several pages to next block after some time

In my study, I want participants to answer 4 questions (each on a separate page in one block) in 2 minutes. If 2 minutes have passed then I auto-advance them to the next block. Participants do three rounds of this with 4 questions per round (so, one block per round and each block has 4 pages for the questions).

I use the javascript code from the following post to do this, where I created embedded data for TimeLeft before each round block and then for each page in the block add javascript code:
https://www.qualtrics.com/community/discussion/744/how-to-auto-advance-a-block-and-with-using-the-same-countdown-timer-on-all-pages

However, I am encountering some problems.
1) The auto-advance after 2 mins does not stop at the end to block, but keeps skipping the first few pages in the next block. I tried having different names for embedded data (TimeLeft1, TimeLeft 2 etc. ) for each block but it is still happening.
2) When auto-advance happens after 2 minutes, the participant can see the pages being skipped. Is there a way to avoid this?