I just started receiving errors today:

{
  "code": "INSUFFICIENTPERMISSION",
  "message": "You do not have permissions to set a value for element lastmodifieddate due to one of the following reasons: 1) The field is read-only; 2) An associated feature is disabled; 3) The field is available either when a record is created or updated, but not in both cases.",
  "type": "ERROR"
}

I'm not updating that value:

if ($netsuiteEmployee->email !== $employee->getEmail()) {
            $netsuiteEmployee->email = $employee->getEmail();
        }

        if ($netsuiteEmployee->firstName !== $employee->getFirstName()) {
            $netsuiteEmployee->firstName = $employee->getFirstName();
        }

        if ($netsuiteEmployee->lastName !== $employee->getLastName()) {
            $netsuiteEmployee->lastName = $employee->getLastName();
        }

        if ($netsuiteEmployee->mobilePhone !== $employeeCell) {
            $netsuiteEmployee->mobilePhone = $employeeCell ?: null;
        }

        if ($netsuiteEmployee->isSalesRep !== $employee->hasRole('ROLE_LEDMS_ROLE_2')) {
            $netsuiteEmployee->isSalesRep = $employee->hasRole('ROLE_LEDMS_ROLE_2');
        }

        if ($netsuiteEmployee->isInactive === $employee->getIsActive()) {
            $netsuiteEmployee->isInactive = !$employee->getIsActive();
        }

        if ($netsuiteEmployee->entityId !== $employee->getFullName()) {
            $netsuiteEmployee->entityId = $employee->getFullName();
        }

        $request = new UpdateRequest();
        $request->record = $netsuiteEmployee;

        $response = $this->netSuite->update($request);