monitor arm keeps tilting down

BlackArc Gaming Chair Outfitted With Footrest, Headrest, Lumbar Support Massage Pillow, Reclining Seat/Arms

Flash Furniture Kelista Mid-Back Swivel Ergonomic Task Office Chair with Flip-Up Arms and Transparent Roller Wheels

Costway 360° Swivel Counter Height Barstool with Padded Seat & Back Footrest Metal Frame

LeisureMod Harris Office Arm Chair - Ribbed Leather with Chrome Metal Frame - Modern Swivel & Tilt Executive Desk Chair for Home Office

BlackArc High Back Reclining Gaming Chair in Faux Leather - Height Adjustable Arms - Headrest & Lumbar Support Pillows

LeisureMod Benmar High-Back Leather Executive Office Desk Chair - Ergonomic Swivel Chair with Chrome Frame, Adjustable Height, & Tilt Lock for Office

Modern Upholstered Tufted Office Chair with Arms Gray - Techni Mobili

Emma and Oliver Ergonomic Mesh Office Chair-Synchro-Tilt, Headrest, Adjustable Pivot Arms

Flash Furniture Mid-Back Vinyl Executive Swivel Office Chair with Chrome Base and Arms

Flash Furniture X40 Gaming Chair Racing Ergonomic Computer Chair with Fully Reclining Back/Arms, Slide-Out Footrest, Massaging Lumbar

Karl Home Electric Shampoo Bowl and Chair Backwash Unit with Reclining Legrest and Tilting Porcelain Shampoo Sink

Merrick Lane Contemporary Mid-Back Home Office Chair with Padded Arms

LeisureMod Vantage Series Modern Office Chair – Black Leather Upholstery with Stainless Steel Frame, Swivel Desk Seating for Home Office or Workspace

HomeStock 42 in.H Adjustable Height Black Faux Leather Seat Material with Adjustable Tilt Office Chairs

Leisuremod Vanguard Modern Leather Office Chair, Mid-Back Executive Desk Chair with Chrome Steel Base, Tilt Mechanism & Smooth Casters

Wit Modern Industrial Simple Assembly Swivel Office Chair with Faux Leather And Tilt|ART OF LIVING DESIGNS

LeisureMod Sonora High-Back Leather Office Chair with Adjustable Height, Swivel, and Tilt, Ergonomic Design for Desk, Conference Room, or Home Office

Flash Furniture High Back Designer Smooth Upholstered Executive Swivel Office Chair with Chrome Base and Arms

Home Office Chair with Adjustable Height and Tilt

DEXYLLO Ergonomic Mesh Desk Chair with Adjustable 3D Headrest Tilt Function, Big and Tall Reclining Chair with Lumbar Support and 3D Armrests

RESPAWN Flexx Mesh Gaming Chair With Lumbar Support and Adjustable Headrest

Flash Furniture Mid-Back Mesh Swivel Task Office Chair with Chrome Base and Arms