Once PhpDig starts back up, it should try and use any content in the tempspider table according to the config and admin panel settings, so you don't want to empty that table at this point. If the table is already empty, then there are no links to be indexed being stored in the table from any already indexed pages. When you click a green check icon, whether on the left or right side of the screen, only that particular content is reindexed, i.e., it reindexes what has already been indexed to update just those pages. If you wish to reindex, and follow new or yet to be indexed links, use the textbox on the index page of the PhpDig admin panel. Set LIMIT_TO_DIRECTORY to true in the config file to keep the reindex within a certain directory, assuming you don't want to reindex the entire site, and choose no if you want to change the drop down numbers between indexes. As your Internet connection is prone to drops, try LIMIT_TO_DIRECTORY and then use the textbox for the incompleted folders you'd like to index. There is also
this thread that you may find useful, and if you are using PhpDig 1.8.7,
this thread may be helpful too.