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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
From what you have described here this sounds like an intermittent internal electrical fault with the instrument cluster itself.I have seen the instrument cluster fail in the past before acting up like this here needing replaced.I would have the fault codes checked/read out of the instrument cluster with a compatible scan tool plugged into your vehicle to see what codes are set as this will help diagnose and repair this issue here.
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Unfortunately my info doesnt cover this wiring or the relays on this model here that I can see when I did a search earlier on this.Others here may be able to assist further though.
I will open your question up for others here to see if someone else can assist further on this as there may be others here that may have more info on what to check or do with this issue.I hope you can get this resolved with ease.No need to reply to my last post here unless it is a last resort as it will keep your question locked to me and others will not be able to view it.If you feel you want to continue to work with me on this feel free to reply at any time but keep in mind in some cases it can be difficult to fully diagnose or help repair this without seeing your vehicle.
Pretty old Passat! There were some issues on these, it is in the instrument cluster circuit board. If you take the cluster out, and remove the gauges and all from the circuit board, and remove the circut board from the cluster, then you can access the back side of it. You can apply a soldering iron to each of the pins on the board, melt the solder, and see if it drops away to the backside of the board. If so, add a little more electrical solder.
Does your clock reset itself? In that case you could replace the load reduction relay, but I know these circuit boards go bad on these Passats and Corrados from about this vintage. (I am on my 4th 93 Eurovan and have done this to all of them because of faulty fuel gauge and temp gauge readings) Not so much with the Jetta/Golf for some reason
Let me have your VIN and I can look up info specific to your build data
The load reduction is in position 4 in the relay panel under the dash- top row, reading from the left. it should have an "18" printed in white on the top face.