Thanks for the information, yes I do keep it lubed but I do need to do it again today. Alignment is just the wheel alignment right? The notches are the same on both sides so should not be it. Maybe it is frozen links like mentioned above. .
Motion Pro Chain Alignment Tool - 08-0048 I have 8 foot straight edge, alignment string, laser level etc.
The Motion Pro was the best $20 I ever spent on my bike, ---as to the notches on the swing arm, I would make a comparison of a machinist using a tape measure to mill a piece of steel to 1/8 inch as opposed to using a micrometer to measure 0.1250 ". I found measuring the distance between the swing arm and rim on both sides was better than using the notches.
Once the links are ceased , it usually means a new chain, as the chain is permanently lubed, the O rings keep this lube in, cleaning oiling the chain removes debris and keeps the dirt out of the O rings, When the O rings fail, so does the chain.
Some on this forum use a oiler, if you understand how and why a chain is permanently lubed / sealed, you will understand why once that seal is broken , so is the chain.
Simply put, perfectly machined round surfaces with just enough lube , sealed inside, transferring energy from the motor to the rear wheel, some of that energy is lost in friction, which creates heat. Once the chain starts to wear, those round surfaces get deformed, which increases friction and produces more heat, this heat can cause a link to lose all lube, continued use causes the metal to deform and ceased links are a result. Adding lube to a ceased link may free it up and get you home, but the chain is done.
Last thing, having what you think is loose is better than making the chain too tight, if too tight, reversing the process doesn't fix the damage done to the chain when it was too tight.