google play services is restarting

Backup your data, do a double wipe (factory reset) and restore the data.

http://gadgetguideonline.com/s7/sasmung-galaxy-s7-how-to-guides/how-to-clear-cache-partition-on-galaxy-s7-and-galaxy-s7-edge/

i dont want to do factory reset unless it is only option

link is for deleting cache

if i delete cache; will all my apps be deleted?

if i delete cache; will all my apps be deleted?

Yes

Double wipe is your only option.

Just backup your data.

Goto Settings -> Backup and Restore

Also, backup your SMS using SMS Backup and Restore app

As cache partition is separated from your data and files in the storage, it is safe for your data and settings when you wipe cache partition on Galaxy S7 and Galaxy S7 edge.

In other words, your files, settings, apps will NOT be affected when clearing cache partition.

That is a quote from article you gave me.

Can I do a single wipe instead of a double wipe to keep data?

The last resort is to backup data and do a double wipe of system cache.

http://thedroidguy.com/2017/02/samsung-galaxy-s7-pops-messages-stopped-error-android-7-nougat-update-troubleshooting-guide-1070327

Try the first two steps in the link above before you try the last resort.

https://www.experts-exchange.com/questions/29018266/Android-7-0-gets-error-constantly-Delivery-has-stopped-Close-app.html

You still need a double wipe. You can try to clear cache partition first to see whether you help. BUT, to play safe, you MUST do a backup first.

This first step is with messages app


Step 1: Reset the Messages app to its default settings

The rule of thumb is to go after the app that’s explicitly mentioned in the error message so in this case, we’ll go after the Messages app itself. However, you may lose all your text and picture messages if you did this but it can potentially fix the problem.

From the Home screen, tap the Apps icon.
Find and tap on Settings.
Touch Applications and then Application manager.
Swipe to ALL tab.
Find and touch Messages.
Tap Storage.
Tap Clear cache and then Clear data, Delete.
After doing this procedure, open the Messages app and then compose a message and send it to your own number just to see if the error shows up or triggered.

It may be the only procedure you can do to fix this problem, however, if the error still pops up, then the next step might help.

Step 2: Try to see if the problem is caused by a third-party app

Third-party apps have a tendency to mess up pre-installed ones that’s why it’s imperative that as early as now you isolate the problem to know if one or some of your downloaded apps is causing the problem. To do so, just boot your phone in safe mode (diagnostic state) to temporarily disable all third-party apps, follow these steps:

Press and hold the Power key.
As soon as you can see the ‘Samsung Galaxy S7’ on the screen, release the Power key and immediately hold the Volume Down key.
Continue holding the Volume Down button until the device finishes rebooting.
You may release it when you can see ‘Safe mode’ in the bottom left corner of the screen.
After the phone has successfully rebooted in this mode, compose a text message and send it to your own number to try to trigger the error. If the problem is fixed, then there is an app that’s causing this problem. Try to uninstall third-party apps you suspect and then boot your phone in normal mode and send a test message to yourself.

You may have to uninstall more than one app to determine which one’s the culprit.

On the other hand, if the problem still persists even in safe mode, then it’s possible we’re dealing with a firmware problem. Move on to the next step.

Step 3: Delete the system cache so they’ll be replaced


Do not do step 3 yet

I dont want to do a double wipe (which would probably be easier than me learning steps)

I do not understand alternatives and I am stuck at a step

I went to settings
apps
clicked on the app
storage
clear data
clear cache

and that stopped the app crashing for a while
and then the crashing comes back after alot of activity
I repeat and it works again for a while

Post back the list of all apps installed.

Did you install any app not from Google Play Store?

Did you install any app not from Google Play Store?

No apps that are not on google play.
my phone is not unlocked and I think I would get viruses if I install

I dont know how to show a list of all apps

I have reviewed your question again.

Your Samsung S6 is updated to Android OS 7 from Android OS 6. It is common to have Google Play Services error for a major OS updated. The only solution which is permanent is a factory reset and reinstall all apps.

Could i roll back to android 6

I dont want to factory reset.

I did factory reset
Thanks