This is due to the default memory that we allocate to each client.
You may need to override the default php.ini.
To configure your own php.ini:
1. Go to your cpanel
2. Go to the File Manager
3. Select public_html
4. If php.ini is not set, create a new file and name it "php.ini"
5. Add in these line:
upload_max_filesize = 160M
post_max_size = 150M
memory_limit = 160M
upload_tmp_dir = 160M
max_execution_time = 180
;*Hide our info
expose_php = Off
;*Turn off for performance
register_globals = Off
register_long_arrays = Off
register_argc_argv = Off
magic_quotes_gpc = Off
magic_quotes_runtime = Off
magic_quotes_sybase = Off