DSO Quad is too slow (desing problem??) very desapointed

Hi, Im the owner of 4 DSO nano v2, I liked their performance but I needed 2 channel, so I decided to buy 2 DSO Quad… AND IM GETTING NUTTS!!!

When I put the DSO nano in scan mode, it SCANS!!, but when I put the DSO Quad in scan mode or abobe 1ms scan time it just freez until the next pass… even more when I put the scant time in lets say 500ms it just freezes for atleast 2 or 3 minutes until the next pass…

Is there any desing problem? does it have a workaround?. Thanks