Never enough light

I have a D3400 that I bought almost 2 years ago. just after the warranty ran out, it seems I could not get enough light to take pictures. It seemed even when I had good light, I would have to slow the shutter speed way down to get the camera to have an effective exposure. If I was taking some landscape photos, I would set the f-stop to between 8 and 11 with an ISO of either 100 or 200 and I may have to set my shutter speed to maybe 1/80 or slower. This is on a nice bright day.
I sent the camera to a Nikon repair facility and they said they cleaned it and that is it. I got it back and it worked fine until this winter and it happened again. I really don't believe it was dirty, I am quite careful with it, I keep it in a bag and I think I take pretty good care of it.

I tried resetting all the setting, I update firmware the first time this happend with now glory.

Does anyone have any ideas? I really do not want to send it back in if I don't have to.

Thank you in advance!

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Yes, it is consistent with all my lenses, I actually had a friend at work bring in his 3300 and used his camera with my lens and his lens on my camera to compare. Set the two cameras to the same settings and my shutter speed requirement was much slower to attain a good exposure.

Yes if I open the f-stop up it does effect the shutter speed requirement, but it is still much too slow to be able to take good pictures.

Most of my photography is landscape and try some wildlife. This is not helping with that for sure.
When you ask about the way I shoot, do you mean as in manual, shutter priority or aperture priority. Normally manual.

I had it in the Nikon bag that came with the camera, now I have it in a back pack. I live in upstate NY and my home is actually quite dry. Summer humidity is existent, but not much of an issue here. I shoot mostly in manual mode.

As you and cwgrizz mention about exposure, I did not think to change to a priority mode, I should probably give shutter or aperture priority a try to see the effects. I will try that today.

If you post a picture with EXIF data, I expect to see -3 or more stops of Exposure Compensation set on your camera.

Hello to all,

I really appreciate the assistance, I got busy with work yesterday and have not been able to check more on my camera. I hope be able to get out today and take some photos with different settings as examples with data that can be analyzed. If I can't today, I will for sure this weekend.

Again, I am grateful for the assistance.