InvaliD token Cart Update 4.6.11214 to 4.6.4

[DadoO]

Hello 

 I have Joomla version 4.4.14 and VirtueMart version 4.6.11214.
Everything was working fine.
I received a notification for an update to version 4.6.2, which I installed.
 Then another notification appeared: version 4.6.4. So far, so good.
 On Wednesday at 3 PM, sales were going smoothly, no problems.
But then, strangely, yesterday at 6:40 PM, I got an "Invalid Token Cart" error.
 And it keeps happening.
 I tried changing the PHP code and setting limits, but to no avail.
I reinstalled version 4.6.4, but the problem persists.
I read Milbo's message, applied the token plugin, but nothing changed.
I also applied the command line in the template, but nothing changed. And all four suggested solutions failed.
Impossible.
I had to revert to version 4.6.11214.
And everything has been fine since then.

What's so strange about this, considering it worked for only 24 hours?

Please guide us in resolving this, because I'm sure I'm not the only one.

Thanks for all in advance
David