VPN tunnel keeps going down. I'm at a loss.

tldr; My site-to-site goes down periodically. If I manually reset it, it lasts 7.5 hours. If it eventually resets itself, the time it lasts varies.

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Hi everyone. I have a problem with my site to site tunnel and I can't figure it out.

I have my main network and I have a satellite office.
I've set up a tunnel between the two and it periodically goes down for hours at a time.
The external interface on the satellite side never goes down. I can always ping it.

On my main side, I am using a Palo Alto (PA-3050 x2 (HA)) managed by Panorama.
On the satellite side, I am using a Juniper SRX 100.

[Palto Alto] <> [tunnel] <> [Juniper]

I've tried the following:
* Lowering the MTU to 1350 on the Juniper.
* Swapping one Juniper for another, both factory reset.
* Disabled all ALG inspection on the Juniper.
* Delete settings on Palo Alto side and recreate them.

I'm sure there's more that I'm forgetting.

The only thing that seemed to make a difference was the last one.
I didn't create the Palo Alto side of the tunnel and noticed some discrepencies such as the lifetime seconds were different on both sides.
I set it to 8 hours.

Changing the lifetime actually did make a difference.
Now instead of going down every hour or so, it lasts about 7 hours and 30 minutes.

Also, I notice the tunnel takes around 10 minutes to start passing traffic once the firewalls show that its up.
In other words, I'll reset the tunnel and it shows both IKE and Ipsec are connected, but I can't ping through it until about 10 minutes later.

It seems like the tunnel is dying before its 8 hour lifetime and then if it re-establishes itself eventually, the two sides get out of sync or something sooner or later.

Or who knows? Maybe the time has nothing to do with it.

So here are some logs and configurations.
100.50.10.33 is our home network (Palo Alto).
200.1.1.74 is our remote network (Juniper).
10.20.20.1 is the internal interface which I'm performing a continuous ping.

I replaced the real IPs with fake ones for this post.

Palo Alto config: https://imgur.com/a/awPM9Ut
Juniper config: https://pastebin.com/9fiz47aP
Palo Alto logs: http://devante.org/pa_logs.html
Pings (warning, 11 MB text file): https://drive.google.com/open?id=1SimthgtZaV2eekD6iYWDKndw8dr-eI5s

Breakdown of pings:

04/27 23:34:30 Up 7 hours, 26 minutes and 1 second
04/28 07:00:31 Down

04/28 07:10:27 Up 7 hours, 26 minutes and 29 seconds
04/28 14:36:56 Down

04/28 22:23:21 Up 7 hours, 26 minutes and 20 seconds
04/29 5:49:41 Down

04/29 8:08:26 Up 7 hours, 28 minutes and 26 seconds
04/29 15:36:52 Down

04/29 16:15:53 Up 7 hours, 27 minutes and 26 seconds
04/29 23:43:19 Down

04/29 23:53:19 Up 7 hours, 26 minutes and 22 seconds
04/30 7:19:41 Down

04/30 8:09:42 Up 7 hours, 34 minutes and 3 seconds
04/30 15:43:45 Down