check if hrm strap is connected

Found it in the connect app. Not only my last run was not-paired, also the one before. And some more before that. It puzzles me. Why is this happening? I will pay attention to the message of "external Heart Monitor found" before starting my run. Maybe that helps.

It may be worthwhile un-pairing and re-pairing the HRM as a precautionary step.

It's strange, never happened to me. This only occured me when I forgot to turn off the Airplane Mode on the watch.
 S.M.R. 's suggestion it's a good step to do.

So I did a minute ago. See if that helps. Of the 13 runs so far this year, 7 runs did not register the strap. An unacceptable amount, so worth trying to solve the issue.

I agree, it should be nice to have an icon somewhere, at least on the activity start "page" showing that chest strap is paired.

Anyway on 17.26 chest strap is loosing connection quite often.

Are you sure the hrm dual works? 99% of the time it's a dead battery or a broken HRM dual. 

I have the same problem with a new hrm-dual.
usually no connection is established.
deleting the hrm-dual and searching manually only works after 3 or 4 attempts.
Battery status shown as good