V50 1.6 Relay click in the fuse box (interior) – car no longer starts

Hello, I have a V50 1.6 DriveE 2012 BJ. The car was standing about 6 days. Today tried to start. Keys in, turned upside down and all lights in the tacho have flashed/flaked and stayed out at some point. After that a click noise has appeared under the glove compartment. I think a relay in the fuse box? As I see it, there is only one relay in the interior. Can you easily try to expand/change it without finishing the battery? After a while (about 1h) the click has stopped. When I then put keys in (0 position) no click noise. On 1 position it starts again with clicking. On 2 or 3 position it stops. If I then pull out the key the click remains again. I can no longer even operate the central lock with my key. Tacho also shows nothing anymore. So I have found a similar problem here (unfortunately only in English):https://www.volvoforums.org/showthread.php? the clickspace was uploaded.