Export not working

Never had a problem exporting my entire log to csv. Now it gives me 1 of 3 responses (listed in order of frequency):

1. blank; no csv to download
2. “Allowed memory size of 1342177728 bytes exhausted (tried to allocate 32 bytes) in /data/…/wp-includes/meta.php on line 830”
3. Scheduled maintenance (only happened once)

I need to provide this csv for a client early next week. Please help!! Thanks!