Mullicam edit causing programme to freeze

i having enormous problems multicam editing.

 

for no apparent reason in middle of editing timeline continues play programme completey freezes.   way stop go task manager , manually force programme close.

 

i have had problem time. have googled problem , have spoken adobe advisor came onto pc remotely investigate. did usual things, emptying cache, deleting preferences etc hasn't made scrap of difference.

can please throw light on might causing maddening problem?

thanks,

brian

i reas somewhere minimising audio tracks helps, doesn't.

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