[JB] [JB11]ST60+ Wind Instrument

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I have a 1998 Gozzard 36 sailboat that I purchased 4 years ago. I have Raymarine and Raytheon instruments and my chart plotter is Standard Horizon. These are the instruments that came with the boat and I have not done any instrument upgrades yet. Over the past couple of years I have added six solar panels, a Silent Wind generator and upgraded my battery system to Lithionics.

For my wind, depth and speed instruments at the helm I have Raymarine ST60+ and at the navigation station down below I have a Raytheon Multi. Last Saturday, May 23 ,2020 I was out sailing and the wind speed digital readout would to two different things:
1) It would work for about 5 minutes with the wind speed numbers showing up then three horizontal lines would display were the numbers used to be.
2) Other times on Monday, there would be numbers indicating wind speed and after 1-2 hours it would only show the three horizontal lines. Usually when I would turn the electronics off at the breaker and then start again in 2-5 minutes it would work for a while, sometimes 5 minutes and other times 1-2 hours, then the numbers would go away and the three horizontal lines appear.
The wind direction pointer on the Raymarine ST60+ has not been consistently exactly the same reading as the wind vane at the top of the mast since I purchased the boat, but it was only about 5 degrees off. On the same day in question it was 45-90 degrees off and sometimes it would jump around erratically all over the 360 degree dial.

The depth indicator (also a Raymarine ST60+) would often in shallower water, 15-200 feet, give an accurate reading that would correspond closely to the nautical chart. In deeper water, 200-800 feet, it will give a reading from 10-16 feet and number would jump around.

The only trouble shooting I have done so far is to unplug the cables from the back of the Raymarine ST60+ units and check to see if there was dust or corrosion on the contacts and see if the plug ins were loose. I brushed them with a small nylon brush but there did not seem to be much dust and no corrosion so I plugged them back in firmly.

Would you be willing to help me figure out what is going on with my instruments and suggest suitable repairs?

Kent de Vigne