Vinyl siding needs to be able to expand and contract. If it’s nailed too tightly, this can lead to buckling and warping issues. You can test if it’s nailed too tight by trying to slide the siding back and forth. You should be able to horizontally slide the siding about a half inch. You may want to consider a professional assessment from a licensed home inspector or siding contractor, to determine if this is source of your problem and to offer solutions. This is a very common issue with siding that was self installed. Vinyl siding must be installed with breathing room. This can also happencertified-vinyl-installer if the siding was not aligned properly. This is a common issue near windows and edges where pieces of the siding may have been notched out. Nail placement is also very important. The nails should be installed centered and straight. A general rule of thumb, is to choose a certified vinyl siding installer to ensure proper siding installation. It’s a more complicated and specific process than many people often realize. If you do choose to self-install vinyl siding, be sure to learn the ins and outs before hand. Here’s a link to a handy visual guide to proper vinyl siding installation from the Vinyl Siding Institute: James Hardie Siding!