Just to clarify or add, just in case some may misunderstand.

If the investment portion if enough and generate reasonable good return, then no issue of the "fixed premium".

While if the investment portion is actually making a loss (it can make a loss, no guarantee it will make money),
then be prepare to see "love letter" from insurance company for premium increment, when the cost of insurance become too expensive and unable to cover by the investment portion.

This is how investment linked policy work to cover on medical.