Your issue looks like you're losing the X line from the ignition switch
That powers Fuses 31,32, 33,34,37 involving a pair of relays in the fuse block:

2/30 Marked "105" that powers the ECC and central locking
and 2/60 another relay marked "107"

The delay is a major puzzlement. I don't know how you can get a delay in the ignition switch X line. That's a weird failure mode. How long is the delay?
Does it vary?

I'd go to Volvo and get a new OEM ignition switch for openers.
I'd find out how the main fuse block ground "31/50" returns to the battery.
Both relays ground to 31/50 somewhere at the main fuseblock, You're in need of a quality high current mechanical connection back to the battery negative post.

Where there's another with the same problem, it may be a lousy ground connection
at the battery, something easily overlooked. Notice the piggy backed cables there that all need solid connections. The wires can get loose and corroded in the crimps and start to act weird.

Bill