Running CiviCRM 5.11 plugin on WordPress. This is a fresh install.
Running on a shared hosting service (Arvixe).
PHP release is 7.1
The Import file is less than 10,000 records. One time, it was successful but all subsequent attempts with different files fail with an HTTP 500 Internal Server Error.
Arvixe tech support has set file/directory permissions but won't tell me exactly what they did.
Time out is set to 300 in PHP
What else can I do?