It sounds like it very well could be the spring, even if it's stock it doesn't hurt to put in the Shooters Design 150% hammer spring. Though I would also recommend putting in SD steel valve knocker if you're going to change the spring.
I noticed a similar issue in my TM G17, which was wholly due to the stock spring being to weak, all I would get is a quick 'puh' of gas and the slide wouldn't even cycle, upon putting in the new spring it cycled and worked perfectly.
I haven't had any issues with the spring in my TM G18C though I have recently installed a 150% spring in it and used the G18C spring in my G17 which is temporary until I get another hammer spring.
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