Since daily suggested workout my VO2 has gone down

I’m in the same boat. In the last 3 weeks by VO2 has gone from 62 to 59 without a change to my training. Been getting more and more frustrated  to see it decrease. I do need to start integrating more speed work, however I did not think I would be seeing this large and stead of a drop to VO2

Me too, however I believe that now is more in sync with a real value. The long slow pace runs were dominant at beginning and that decreased my vo2max.

I have exactly the same experience (see my thread in the Marq forum: https://forums.garmin.com/outdoor-recreation/outdoor-recreation/f/marq-series/246844/daily-workout-suggestions-running-positive-impact ). Since I started following the suggestions, my VO2max first went up from 56 to 58 (in a few weeks) and then progressively decreased to now 54. 

Since 22 November I had no productive trainings anymore, all unproductive and now even detraining. My advice is to not follow the suggestions as they clearly do not take into account your current fitness level. 

On my case VO2max has remained stable and marginally increased.

I am outperforming the suggestions though.either in pace or heart rate.

If I have a threshold run at say 4:15 per km and 175HR, I am able to so sightly faster and with less HR.

I do find the suggested pace and HR zones largely consistent with my own conclusions and other external sources.

Over the weeks it does try to increase intensity. For example, on threshold runs, I started with 4*7', then 1*24', 1*30' and lastly 2*19'. So some slow and nice progression.

One criticism is that it tries to maintain balance and also training load. But if my training load was slow to begin with, it is bound to remain low.

We must bear in mind that v02max is affected by lots of factors, sleep, stress, nutrition, GPS conditions etc.

I would like to be integrated with specific goals. Like if I have a marathon 5 months from now,it would gear my workouts suggestions towards that goal.

You're luck to use suggested workout: I can't !

I'm running about 120kms per month with about 3000m d+ at about 5.44min/km. Garmin says me I've 50 vo2max (39 years old). 2 days per week I make interval running (7 to 11kms) beetween 4.5-5.1min/km.

Suggested workout *always* (since first beta) tell me to run slowly at about 6.5min/km for 45min. No interval running, no faster run, no ... It's only suggest me to increase my Base Training Effect (witch indeed I never do: when running I'm mostly doing VO2Max or Threshold TE, sometimes on long fundamental run Tempo TE).

Care to show us your training load balance? If you are low on base training, then the watch is right to suggest it because that it is programmed to do. You are also right not to follow this.

As the say, run slow to run fast.

I was so sad to see my vo2 max drop a point yesterday also from 50 to 49.

I've been using HRM pro for about two months so maybe the metrics are more accurate now?

sad nevertheless and coincidentally its telling me the training load is over trained? could this be the culprit?

The watch want us to have a balanced training load. That is everything in the optimal zone. You are having too little zone 1 and 2 runs.

This is perfectly fine if you prefer it this way, but the watch will try to tell you otherwise.

I am being very mindful of my easy and recovery runs. I find the suggestions of pace and HR to be very much within my expectations.

If you are feeling that you are making progress and you are happy don't change anything.

When you feel like it, you can try following the suggested workouts for a couple of months to see where that lands you.