AeroPod, PowerPod and Newton

Set up my new Powerpod yesterday. Downloaded Isaac and set up a profile. Followed the video to set up sensors. Switched on my Garmin 500 and followed another Youtube video to set it up. Thought all was great.

Went on a test ride and could see the power readings just fine. Stopped on a hill and then switched off the Garmin. Went back to ride home several hours later and turned on the unit and the Garmin. The Garmin wanted to calibrate again. It did and came up with a number of 319. I hit back a couple of times so that I could start my journey. Off I went with readings at one point going to 1100w the eventually dropping to 700 then down into the 300s, which would have been more likely.

Today, I went on another ride. All was good until we stopped for coffee. When I went back to the bike and switched the Garmin back on it wanted to recalibrate again (It seems to do this every time). Not sure what happened next, but my power went to 0W for a bit then to - . All sorts of wierd things seem to display. Occasional power readings and intermittent HRM. Later, when someone had a mechanical I rebooted the Garmin, recalibrated the Powerpod and then got wierd readings for a bit and then it seemed to heal itself.

So, my questions are:
1. Does the Garmin need to recalibrate with the Powerpod every time its switched on or am I doing something wrong?
2. When you start each ride does it always take a few mins for the correct power readings to show?
3. I've not taken the Powerpod off the bike to download the rides onto Isaac yet. I assume I have to do this everytime or is all of the Powerpod power information stored on the Garmin too? (Just logged on to Garmin Connect and see that it is)
4. Do I have to do my analysis in Issac or can I download it to Strava? (I don't have Strava Premium)
5. I think the way the Powerpod works is cool - That's why I bought one! I don't really have any idea about what to do with the statistics. Can someone point me in the right direction of what I should be doing from here! (My goals next year are to do several 100+ mile rides with some big hills - aka mountains)

Thanks for your time

Hmmmm. I'm still struggling a bit. I've found the following:

1. The answer to my first question seems to be that everytime the Garmin 500 sees the PowerPod it asks if you want to recalibrate. As far as I can see, it doesn't matter whether you choose 'yes' or 'no'.

2. On my first proper ride the first couple of minutes seemed high. But after that the data looks good. On my return home several hours later the reading seem very erratic. On the third ride things look good (although there are some odd spikes). I can't make head nor tail of the next ride as for some reason the ride has been split into 4 files and several miles of the ride have been lost.

3. I see you have to download manually. So, I'll have to put Isaac on a laptop and use that. Then I can recharge in the garage too rather than taking it off.

4. Still no idea on how to get it onto Strava. I use Stravatistics which calculates power. So I end up seeing its power readings and not the Powerpod's.

5. Have read a few things. I've at least uploaded my ftp to the Powerpod now. Still feeling my way.