Looking at a provider with 5 reviews but everyone of them when you click on name of the reviewer it says  
" The page you are looking for might have been removed, had its name changed, or is temporarily unavailable."  
What is the typical reason for this ? What are your thoughts on why this happens ?      

Did the girl delist very recently possibly? I wonder if that is what it says before TER actually removes her profile. Another possibility is that it is some software issue. Also try from a different device/web browser as I guess that could be the problem. Let us know if you find out.

I don't think this is a case of delisting, I think he is talking about a bug that I have encountered a few times. If you click on the reviewer's name to see their review history, you get the message the page has been removed. However if you click on the review and then click on the reviwer's name in the new page, you are able to see the review history.  
.
OP if you are seeing the bug I am describing, take the steps I laid out above. Just click on the review itself to bring it up and then click on the reviewer's name to see his history.

Some reviewers get soft bаnned. Their profile stays but they can't do anything.

Yes , clicking on the reviewers name. I like to check the reviewers history and see if the have one or more, also who have they have seen.

Looks like he's banned. Here's one more thing you can try.
Go to mail and ignore user, enter his name and see if he ends up on your ignore list. I will assume his name is not an alias.

TER likely leaves the review up but if the member got banned or asked to have the account removed then accessing the account (for emailing or seeing a list of reviews) won't be possible.

So I am able to find the reviewers on TER even though all the reviews are not available for this provider. I PMed three of  
them and only heard back from one. Then I tried to text her and got no answer. I again emailed her and she provided a different number other than her P-411 one.  What do you experienced guys think ???
UPDATE  So I just checked and her TER reviews disappeared from her P411 sight , INTERESTING  
https://preferred411.com/P332919  
Also all of her reviewers are now available ?  Is this a TER screw up or something else ? Whitley Winters
TER ID: 350727

This is not an easy one to digest. The reviewers from TER seem legit. 5 reviews spaced out over 5 years isn't great though. The p411 you provide and one on her TER profile are the same. The emails are different, in that one has just her name and the other has her name with the number 1. But that could be a situation where she updated one with her new email and didn't think to update TER. Since you emailed her and got a different phone number, which email did you contact her at?