locking cam isn't 100% releasing...
or it may be too loose and allowing the motor to ''rock'' as it moves causing it to bind...
owners manual covers the fix...
guide posts are dirty and/or dry..
clean the outside of the motor and the inside of the base w/ non chlorinated brake cleaner sprayed on a soft white (no colored rags please) cloth...
DO NOT spray the cleaner onto the motor or base...
above all DO NOT!!! I say again, DO NOT!!! use carburetor cleaner...
now polish the outside of the motor and the inside of the base w/ super hyper fine sand paper, 4/0 wool (synthetic, or stainless but not steel wool or better yet use a white non-woven abrasive pad..
coat the surfaces w/ a DRY SOLID FILM lubricant.. I'm real partial to TriFlow... DO NOT use a wet lubricant...
do the same for the posts...
VOE says WD is a mistake and all myth... it's a wet something or another that attracts all kinds of trash... does way more harm than good in the scheme of things...
I'm real partial to Triflow but most any dry lube will work well providing it's has Teflon/PFTE in it... [higher percentage by volume is more gooder]...
CRC, Tiolube, KG and DuPont each have several most excellent industrial spec DRY SOLID FILM lubricants..
Criteria - dries dry to the touch, high pressure load bearing, contains Teflon/PFTE, barrier forming, extreme temperature range, [usually -100 to +500F] isn't hygroscopic, does not collect dirt, not flammable in dry state, chemical resistant, does not contain silicone, has a long list of compatibles and is really very long lasting... or any of or all the features WD hasn't got any of....
one thing about dry solid film lubricants is that when you apply them and you think that you didn't apply enough you have probably applied too much..
very, very little goes a loooooooooooooooong way...
Just wait until you do your saw's arbor mechanism w/ dry lube.. you and your saw will never be the same... You'll treat everything that moves in the shop in short order... Please thoroughly clean whatever before lubing..
It's a great release agent too...
Dry Film Lubricants are high performance coatings made up of very fine particles of lubricating agents blended with binders and other special additives. Once cured, these lubricating agents bond to the part surface as a solid film which reduces galling, seizing and fretting and protects against corrosion. Through the combination of these properties, dry film lubricants greatly improve the wear life of coated parts.
Dry film/solid film lubricants allow for operating pressures above the load-bearing capacity of normal greases and oils. They are also not prone to collecting soil particulates than greases and oils. In some applications, the coating is self-burnishing, leading to improved, rather than decreased, performance over time. Some blends of dry film/solid film lubricants are also temperature and chemical resistant allowing for their use in harsh environments such as jet engines where exposure to aviation fuel and extreme temperatures are the norm.
This is the type of lubricant you want to use if you have a CNC.
AVOID using anything with silicone in it, because it seems to eventually get on everything including your project and you will have all kinds of finishing problems. Silicone products should be banned from the shop along w/ WD40.
WD will kill bearings in very short order.....
it dissolves the bearing's lubricant...
Bottom line - wet lubricants and saw dust don't go together!