Hi Guys - I am getting this weird error intermittently on my projects approx twice a day - its breaking my whole site 7.15.8

The model item passed into the dictionary is of type 'Models.FlightListModel', but this dictionary requires a model item of type 'Models.FlightListModel'.

and yes you have guessed it it doent make any sense to me - normally the 2 tyes differ - strangely all my custom models that use @HTML.Action in the same format seem to be broken on my site at this point. i think it may be related to examine but im not sure. has anyone ever encountered this ?

The code we use to try and call this is a simple action in razor:

@Html.Action("RenderLists", "Lists", new { searchResults = Model })

What i have noticed is that my other custom models arent working as well as we have a similar call on another page that is also broken - can anyone give any advice on this please?

@Html.Action("RenderMetaData", "Meta", new { area = "MetaArea" })

if i make small chnage in the code or upload a new dll it normally fixes the issue. im on an IIS setup but i don think this is the issue

all help appreciated in advance - thnak you.