Being offered draw causes game to stall. Why?

This has now happened to me on at least four occasions in just last few weeks and it is getting annoying!

In todays game, my opponent offered a draw when he only had his king left, whilst I had bishop and two pawns advancing to becoming queens. I had no obvious way to accept or decline the draw and the game froze with my time still running down. I wasn’t able to move any pieces and thus a draw was eventually the end result when my time ran out.

in previous examples, it was my opponents time that appeared to be running down on my screen, but when this ran out, I was the one who was deemed to have lost. 
In all cases the common theme seems to be that my screen freezes when someone offers a draw. What is the problem? Can I do anything to avoid this happening again?

 Thanks 

i dunno when i get offered a draw theres a button saying "decline draw" and ngl i always offer a draw when im about to lose...

I’m playing on a tablet and the standard view just shows the actual playing board. I have to actively scroll down to look for messages etc. when I do that I see the message offering a draw, but no buttons to accept or decline. 
if the offer is made on their time, I would expect their clock to keep running. If the offer is made on my time, I would expect it to automatically be declined upon making the next move.

This isn’t happening.