Alright so I have Formuler Z8 and Helix if it matters..
When I do catchup (I.e let's say watching the Supercup Liverpool vs Chelsea) and try to forward /rewind... It is very jumpy and inconsistent.
I even adjust the "Jump Interval" to 3min or 5min and ONE click of the fast forward button advances the match like 10-15 minutes which doesn't make sense.
Jump interval seems to work accurately with the VOD but for catchup it is very annoying when I want to skip through bits.
It's a known problem which (I believe) should have been fixed in the latest update:
https://www.formuler.tv/single-post/2019/07/23/July-2019-Formuler-Z8-Software-Update