Hotfix 40.0.5.1
A tiny hotfix to address some server traffic and bandwidth optimizations. None of these changes are player-facing, so you shouldn’t notice any difference. 

Hotfix 40.0.5

Changes:

• Disabled coupons for players using the Epic Launcher due to an exploit.
  • For more information and updates on this situation, head to our official PSA: https://forums.warframe.com/topic/1474623-coupons-temporarily-disabled-on-epic-games-store/ 
• Removed mention of Corpus when Teshin tells players that the enemies' "advanced shields" are vulnerable only to Electricity in The Teacher quest.
  • Players reported that this may cause confusion to new players (thinking that all Corpus shields are vulnerable only to Electricity).
• Removed screen shake caused by your Companion’s melee attacks.
• Changed Vapos Specter's purchase limit from 1 every 24 hours to 7 a week in Nightcap's wares.
  • The daily purchase limit was causing issues where the limit wasn't resetting properly, so we swapped it to weekly. Players can still obtain the same number of Specters a week!
• Updated the music when viewing player Profiles. 
• Made optimizations to the game's memory footprint.

Top Fixes:

• Fixed cases of hacking terminals in Deepmines Bounties not working properly if a host migration occurred while players were still in the elevator.
• Fixed the cases of overlaid Mod or Upgrade screens when swapping to other menus — notably the Mod Menu remaining on-screen when rolling a Riven or viewing the Ayatan Treasures screen.
• Fixed texture issues on the Dagath Yhavan Skin.
• Fixed extremely bright VFX that can spawn from Protea's Grenade Fan.
• Fixed the incorrect Arcane Fury appearing in Rank 14 of Nora's Mix: Dreams of the Dead.
• Fixed drop ships spawning at a high frequency and not leaving after dropping off their units in the Plains of Eidolon and Orb Vallis.
• Fixed being locked in Transference if Sevagoth or Nokko entered a Void Angel Orb while in their passive revive form (Shadow and Sprodling, respectively).
• Fixed a Corpus Shield Drone spawner causing the Drone to spawn into the wall during The New War quest.

Fixes:

• Fixed being able to summon the Atomicycle in a corridor in Stage 3 of The Hex quest, causing players to get stuck out of the map.
• Fixed the Transference Chair having incorrect placement during a different segment of The New War quest.
• Fixed UI errors when starting a replay and then exiting The Chimera Prologue and Erra quests.
• Fixed being presented with a black screen if players attempted to start the Confront Vor mission in the Vor's Prize quest via the TennoGuide, without having installed the Navigation Segment first.
• Fixes towards texture issues on the bottom of various Zariman and Nature Dojo decorations.
• Tentative fix towards a rare case of the Deepmines Bounty door not opening for Clients.
• Fixed some minor UI misalignment on Stats, Rank Bonuses, Overlevelling, Search, and Sort elements in the Upgrade and Mod menus.
• Fixed a floating environment element in the Deepmines tileset. 
• Fixed a minor grammatical error and a typo in Basmu's description.
• Fixed a section of the Deepmines tileset where a player could get stuck.
• Fixed cases of Railjack Mods appearing in the wrong tab after placing them in the Battle or Tactical tabs of the Plexus.
• Fixed Mods missing their background in the Bounty Stage Complete Reward pop-up.
• Fixed a green orb appearing on Client Warframes when holding Resurgence Tokens in Arbitration missions.
• Fixed a non-functioning purchase button appearing on unowned Color Palettes in the Simulacrum Arsenal.
• Fixed cases of Corpus Ships not rendering properly during the fly-in cinematic when loading into a mission.
• Fixed a missing interact prompt for an Isleweaver fragment in Teshin's Cave.
• Fixed the Arsenal opening SFX being muffled.
• Fixed incorrect SFX on the Sprodling decoration.
• Fixed incorrect projectile SFX on the Morgha's regular and alt-fire. 
  • Also fixed missing Heavy Gun summon SFX for the Morgha.
• Fixed a minor visual issue with Varzia's backing image in the Twitch Drops inbox message.
• Fixed a script error related to Xaku's Untime Rift augment.
• Fixed a rare crash when returning from a mission.
• Fixed the "You have pending packs" prompt being triggered by old packs for players using the Epic Launcher.
• Fixed a rare crash when logging in on Steam. 
• Fixed a rare crash when returning to the Dry Dock from a Railjack mission.

For list of known issues that are on our radar, visit our dedicated thread: https://forums.warframe.com/topic/1470876-known-issues-the-vallis-undermind/