XC90 shut off while driving and (trans effected and gages and headlights wentoff

What is your question?

Code is U0073 control module communication bus off. On freeway, engine and headlights shut off for no more than one second and then came back without my doing anything. Later on same drive, engine and headlight continued to function however no gages and no gage functions nor dash lights. ECM?

What makes this problem better or worse?

No change in xomditioms

How long has your 2004 Volvo XC90 had this problem?

Just started - no symptoms prior