"Plot route" issues

I am on my way back from Sagittarius A (about 100 ly away). Every time I try and plot a route the plot route percentage goes up to 98 or 99 and never finishes. I generally can plot up to 1000 years at a time. The closer I got to SagA, the more the routes decreased in max distance. But now I can not plot any route, even 80 ly. Any advice would be appreciated
 
I tried the formula several times, but I was still hanging/slowing to a crawl. I settled for plotting single jumps, hopping G-class star to G-class star within 1000ly from Sag A*. Only about 30-35 jumps each way, and I've found some earth-like worlds in the process, so there's at least that as a trade-off.
 
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