Less than 3 months old and my watch is cracked almost all the way through the plastic - check your 645 for cracks to the watch body on the lugs where the
2 Pcs Tempered Glass Watch Screen Protector With Metal Secure Band Lugs Connector &screwdriver For Garmin Fenix 5/forerunner 935 - Smart Accessories - AliExpress
Fenix 5 Broken Lug : r/GarminFenix
Military Nylon Watch Bands Strap For Garmin Fenix 5X / Fenix 3 HR / Fenix 5 | eBay
Lug Width and Size Difference Between Older (F3) and Newer (F6X) 51mm Garmin Watches : r/GarminFenix
20mm For Garmin Venu Quick Release Replacement Leather Metal Strap Watch Band | eBay