Auth.net randomly stopped allowing renewals when logged in

Recently users of my s2member system are now no longer able to renew their memberships. This just started happening 2 days ago without any changes or updates to the system.

The auth.net log file shows that the output response variables are all NULL. This seems to only happen when users are logged in, as new sign ups work fine.

LOG ENTRY: Fri Nov 6th, 2020 @ precisely 4:05 am UTC
PHP v7.3.24 :: WordPress v5.5.3 :: s2Member v200301 :: s2Member Pro v200301
Memory 9.98 MB :: Real Memory 12.00 MB :: Peak Memory 10.94 MB :: Real Peak Memory 12.00 MB
xxxxxx
User-Agent: Mozilla/5.0 (Linux; Android 10; SAMSUNG SM-G973U) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/12.1 Chrome/xxxx Mobile Safari/537.36
-------- Input vars: ( Fri Nov 6, 2020 4:05:07 am UTC ) --------
array (
‘x_type’ => ‘AUTH_CAPTURE’,
‘x_method’ => ‘CC’,
‘x_email’ => ‘xxxxx’,
‘x_first_name’ => ‘xxxx’,
‘x_last_name’ => ‘xxxx’,
‘x_customer_ip’ => ‘xxxxx’,
‘x_invoice_num’ => ‘xxxxxx’,
‘x_description’ => ‘xxxxxxxx’,
‘s2_initial_payment’ => ‘1’,
‘s2_invoice’ => ‘4’,
‘s2_custom’ => ‘xxx’,
‘x_tax’ => ‘0.00’,
‘x_amount’ => ‘40.00’,
‘x_currency_code’ => ‘USD’,
‘x_card_num’ => ‘xxxxxxxxxxxxxx’,
‘x_exp_date’ => ‘xx-xxxx’,
‘x_card_code’ => ‘xxx’,
‘x_address’ => ‘xxxx’,
‘x_city’ => ‘xxx’,
‘x_state’ => ‘xx’,
‘x_country’ => ‘xx’,
‘x_zip’ => ‘xxxxx’,
‘x_version’ => ‘3.1’,
‘x_login’ => ‘xxxxxxxx/key/tran’,
‘x_tran_key’ => ‘xxxxxxxx/key/tran’,
‘x_delim_data’ => ‘true’,
‘x_delim_char’ => ‘,’,
‘x_encap_char’ => ‘"’,
‘x_relay_response’ => ‘false’,
)
-------- Output string/vars: ( Fri Nov 6, 2020 4:05:27 am UTC ) --------

array (
‘response_code’ => NULL,
‘response_subcode’ => NULL,
‘response_reason_code’ => NULL,
‘response_reason_text’ => NULL,
‘authorization_code’ => NULL,
‘avs_response’ => NULL,
‘transaction_id’ => NULL,
‘invoice_number’ => NULL,
‘description’ => NULL,
‘amount’ => NULL,
‘method’ => NULL,
‘transaction_type’ => NULL,
‘customer_id’ => NULL,
‘first_name’ => NULL,
‘last_name’ => NULL,
‘company’ => NULL,
‘address’ => NULL,
‘city’ => NULL,
‘state’ => NULL,
‘zipcode’ => NULL,
‘country’ => NULL,
‘phone’ => NULL,
‘fax’ => NULL,
‘email’ => NULL,
‘ship_to_first_name’ => NULL,
‘ship_to_last_name’ => NULL,
‘ship_to_company’ => NULL,
‘ship_to_address’ => NULL,
‘ship_to_city’ => NULL,
‘ship_to_state’ => NULL,
‘ship_to_zipcode’ => NULL,
‘ship_to_country’ => NULL,
‘tax’ => NULL,
‘duty’ => NULL,
‘freight’ => NULL,
‘tax_exempt’ => NULL,
‘po_number’ => NULL,
‘md5_hash’ => NULL,
‘card_code_response’ => NULL,
‘cavv_response’ => NULL,
‘card_number’ => NULL,
‘card_type’ => NULL,
‘split_tender_id’ => NULL,
‘requested_amount’ => NULL,
‘balance_on_card’ => NULL,
‘__error’ => ‘Error. Please contact Support for assistance.’,
)

It appears that the auth.net part IS in fact working, and is charging my customers, however s2member is failing and not updating the users etc. HELP!

Nothing was changed in the system, and this randomly started happening. If I am not posting in the correct place please let me know, as I could not find another support option.