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This would be a good option to use.

Hello Tested today and does not increase trainer resistance when hr goes down in final 10min. phase. Target hr is 161 beats and hr goes lowest at 151 beats in final minutes. My old turbo muin unit you can control manually power that you output and you can maintain steady target hr in final 10min. an...

have you fix this issue yet?

up!

You must test your max heart rate with indoor trainer.
Thats only way to get correct results.
What trainer you use? Have your trainer got an erg mode or dummy trainer?

Have you fixed this issue yet?
Changelogs doesnt say anything about that problem has been fixed.
Trainings that software generates are way too easy, you dont reach correct heart rate values on intervals or sweet spot area.

I have the same problem with Direto trainer.
Target heartrate 154 and software allows my heartrate drop under 150beats in final 10min. (third phase).
I have mailed customer care about this problem.
No solutions so far.
You get wrong results at training test.
Trainings get way too easy.